“This road leads to the station, so let's hurry.” What must the speaker be taking for granted for this to make sense?

Correct: C) We want (or need) to go to the station.

The conclusion 'so let's hurry' only makes sense if we actually want or need to reach the station (C); if we didn't, there'd be no reason to hurry. A is not stated, B doesn't follow from 'this road leads there', and D isn't claimed — none of these is the assumption the argument depends on.

“I asked three people leaving this restaurant, and all three had ordered ramen.” From this alone, what can be said most defensibly?

Correct: B) At least these three people ordered ramen.

The only thing established is that the three people asked ordered ramen (B). Concluding anything about the whole restaurant — 'sells only ramen' (A), 'most customers' (C), or 'is a ramen restaurant' (D) — from just three people is an unsupported leap from a tiny sample.

“He's criticizing that health method, but he's just a layperson, not even a doctor — so he must be wrong.” What is the flaw in this argument?

Correct: D) It attacks the speaker's status instead of the substance of the claim.

Whether a claim is right should be judged on its content, but this dismisses it because of who said it ('just a layperson'). That's an ad hominem attack (D). A layperson can still be correct. There's no false dilemma (C) or excess of evidence (A) here.

Which is the strongest (most relevant) reason to support the claim “this bridge is safe”?

Correct: A) Last month a professional inspection agency measured its load capacity and it comfortably met the standard.

What most directly supports 'is it safe' is a professional load-capacity inspection (A). Being beloved (B), looking new (C), or not having heard of accidents (D, hearsay / appeal to ignorance) are weak or irrelevant as evidence of structural safety.

“Sales rose after we launched the new ad, so we should increase the ad budget.” What is an unstated assumption this argument depends on?

Correct: B) The rise in sales was mainly due to that ad.

The conclusion 'increase the ad budget' depends on the rise being caused by the ad rather than by, say, seasonality or other actions (B). If that assumption fails, the case for spending more collapses. A, C, and D can all be false while the argument still stands, so they aren't the assumption it depends on.

“A survey found that children who eat breakfast tend to get better grades.” What is the most careful, defensible inference?

Correct: C) There's an association between breakfast and grades, but this alone can't establish cause and effect.

Correlation doesn't imply causation — a third factor (e.g. home environment) could drive both, so this survey alone can't establish cause (C). A assumes causation, D overstates a tendency into 'always', and B reverses the finding — all overreach.

“This supplement really works — after all, tons of people buy it and it's the #1 bestseller.” Which best describes the flaw?

Correct: A) It treats popularity (many people buying it) as proof that it works.

'It sells well, therefore it works' mistakes popularity for evidence of effectiveness — a bandwagon (appeal to popularity) fallacy (A). Sales can be driven by marketing or price and don't guarantee efficacy. No expert authority (B), topic shift (C), or false dilemma (D) is used.

Which is the most effective objection to the claim “this town should build a new library”?

Correct: D) The town already has three libraries, and data shows all of them are underused.

The strongest objection is data showing the town already has enough libraries with low demand (D) — it directly undercuts the need for a new one. A is an ad hominem against the proposer, B merely notes mixed opinions, and C is a vague prediction — all weak as objections.

“This machine will surely run fine, because the daily inspection found no problems.” What must be assumed for this to hold?

Correct: D) Any problem not caught by the inspection cannot occur (the inspection catches every possible fault).

To move from 'no problem found' to 'surely runs fine' you must assume the inspection detects every possible fault, with no misses (D). If it can miss faults, a problem could still lurk. A, B, and C could all be false without changing the logic, so they aren't the required assumption.

“This year, in this region both umbrella sales and ice-cream sales rose sharply over last year.” What can be concluded?

Correct: A) Nothing beyond the fact that both umbrella and ice-cream sales rose can be concluded from this alone.

Two figures both rising doesn't reveal the reason (population growth, the economy, weather — many are possible), so the careful conclusion is just the fact itself (A). B mistakes correlation for causation, C is baseless, and D guesses at weather not given in the premise — all are leaps.

“If you don't support my proposal, then you don't want this team to succeed.” What is the flaw?

Correct: B) It makes it look like the only options are 'support it' or 'not want success'.

One can oppose the proposal yet want the team to succeed (e.g. prefer a better plan), but the argument narrows it to just two options. That's a false dilemma (B). It isn't an ad hominem (C), circular reasoning (D), or hasty generalization (A).

Which is the strongest reason supporting the claim “walking 30 minutes a day is good for your health”?

Correct: C) Several studies tracking tens of thousands of people over years found regular daily walking associated with lower disease risk.

The strongest reason is systematic evidence — several large, multi-year studies (C). A is a single anecdote, B is an appeal to popularity, and D is an irrelevant celebrity (misplaced authority); all are weak support for a general claim.

“In our employee-satisfaction survey, departments that could choose remote work were more satisfied. So if we roll out remote work company-wide, satisfaction should rise.” Which assumption is most essential for this conclusion?

Correct: B) The higher satisfaction was due to remote work itself, not to other features of those departments (like the type of work).

To claim rollout will raise satisfaction, you must assume the satisfaction came from remote work itself and not from other traits peculiar to those departments (B). If it came from, say, the type of work, company-wide rollout won't help. A would actually weaken the argument, and C and D aren't needed for satisfaction specifically to rise.

A town installed security cameras, and the next year crime in that district fell. That same year, the neighboring district (with no cameras) saw crime fall by about the same amount. What is the most defensible inference about the cameras?

Correct: D) Since both districts fell by about the same amount, the drop may be due to a common factor other than the cameras, and the cameras' effect can't be confirmed from this data.

If the camera-free neighbor fell by about the same amount, the drop likely stems from a townwide common factor (economy, another measure), so the cameras' specific effect isn't shown here (D). Claiming it's 'proven' (A) ignores that the comparison group undercuts it; 'no effect whatsoever' (B) overstates the other way; and C dismisses the inconvenient data.

“This policy is right, because a trustworthy expert says so. And why is that expert trustworthy? Because he supports this correct policy.” What is the main flaw?

Correct: C) It runs in a circle, using the conclusion as its own support (circular reasoning).

The policy is right because the expert is trustworthy, and the expert is trustworthy because the policy is right — the argument uses the very conclusion it's trying to prove as its support, forming a loop. That's circular reasoning / begging the question (C). It isn't hasty generalization (A), a red herring (B), or a slippery slope (D).

Consider the claim “the city should remove the old parking lot to build a new park,” weighing reasons for and against. Which is the weightiest (potentially decisive) objection?

Correct: A) That lot is essential for emergency transport to the nearby hospital, there's no alternative site, and removing it could delay emergency response.

The weightiest objection shows removal would cause a serious, concrete harm — delayed emergency response — with no alternative (A), a strong consideration that can be weighed directly against the benefit (a park). B is a weak minority preference, C is an ad hominem, and D is an appeal to tradition (status-quo fallacy) — none is decisive.

“This road leads to the station, so let's hurry.” What must the speaker be taking for granted for this to make sense?

Correct: C) We want (or need) to go to the station.

The conclusion 'so let's hurry' only makes sense if we actually want or need to reach the station (C); if we didn't, there'd be no reason to hurry. A is not stated, B doesn't follow from 'this road leads there', and D isn't claimed — none of these is the assumption the argument depends on.

“I asked three people leaving this restaurant, and all three had ordered ramen.” From this alone, what can be said most defensibly?

Correct: B) At least these three people ordered ramen.

The only thing established is that the three people asked ordered ramen (B). Concluding anything about the whole restaurant — 'sells only ramen' (A), 'most customers' (C), or 'is a ramen restaurant' (D) — from just three people is an unsupported leap from a tiny sample.

“He's criticizing that health method, but he's just a layperson, not even a doctor — so he must be wrong.” What is the flaw in this argument?

Correct: D) It attacks the speaker's status instead of the substance of the claim.

Whether a claim is right should be judged on its content, but this dismisses it because of who said it ('just a layperson'). That's an ad hominem attack (D). A layperson can still be correct. There's no false dilemma (C) or excess of evidence (A) here.

Which is the strongest (most relevant) reason to support the claim “this bridge is safe”?

Correct: A) Last month a professional inspection agency measured its load capacity and it comfortably met the standard.

What most directly supports 'is it safe' is a professional load-capacity inspection (A). Being beloved (B), looking new (C), or not having heard of accidents (D, hearsay / appeal to ignorance) are weak or irrelevant as evidence of structural safety.

“Sales rose after we launched the new ad, so we should increase the ad budget.” What is an unstated assumption this argument depends on?

Correct: B) The rise in sales was mainly due to that ad.

The conclusion 'increase the ad budget' depends on the rise being caused by the ad rather than by, say, seasonality or other actions (B). If that assumption fails, the case for spending more collapses. A, C, and D can all be false while the argument still stands, so they aren't the assumption it depends on.

“A survey found that children who eat breakfast tend to get better grades.” What is the most careful, defensible inference?

Correct: C) There's an association between breakfast and grades, but this alone can't establish cause and effect.

Correlation doesn't imply causation — a third factor (e.g. home environment) could drive both, so this survey alone can't establish cause (C). A assumes causation, D overstates a tendency into 'always', and B reverses the finding — all overreach.

“This supplement really works — after all, tons of people buy it and it's the #1 bestseller.” Which best describes the flaw?

Correct: A) It treats popularity (many people buying it) as proof that it works.

'It sells well, therefore it works' mistakes popularity for evidence of effectiveness — a bandwagon (appeal to popularity) fallacy (A). Sales can be driven by marketing or price and don't guarantee efficacy. No expert authority (B), topic shift (C), or false dilemma (D) is used.

Which is the most effective objection to the claim “this town should build a new library”?

Correct: D) The town already has three libraries, and data shows all of them are underused.

The strongest objection is data showing the town already has enough libraries with low demand (D) — it directly undercuts the need for a new one. A is an ad hominem against the proposer, B merely notes mixed opinions, and C is a vague prediction — all weak as objections.

“This machine will surely run fine, because the daily inspection found no problems.” What must be assumed for this to hold?

Correct: D) Any problem not caught by the inspection cannot occur (the inspection catches every possible fault).

To move from 'no problem found' to 'surely runs fine' you must assume the inspection detects every possible fault, with no misses (D). If it can miss faults, a problem could still lurk. A, B, and C could all be false without changing the logic, so they aren't the required assumption.

“This year, in this region both umbrella sales and ice-cream sales rose sharply over last year.” What can be concluded?

Correct: A) Nothing beyond the fact that both umbrella and ice-cream sales rose can be concluded from this alone.

Two figures both rising doesn't reveal the reason (population growth, the economy, weather — many are possible), so the careful conclusion is just the fact itself (A). B mistakes correlation for causation, C is baseless, and D guesses at weather not given in the premise — all are leaps.

“If you don't support my proposal, then you don't want this team to succeed.” What is the flaw?

Correct: B) It makes it look like the only options are 'support it' or 'not want success'.

One can oppose the proposal yet want the team to succeed (e.g. prefer a better plan), but the argument narrows it to just two options. That's a false dilemma (B). It isn't an ad hominem (C), circular reasoning (D), or hasty generalization (A).

Which is the strongest reason supporting the claim “walking 30 minutes a day is good for your health”?

Correct: C) Several studies tracking tens of thousands of people over years found regular daily walking associated with lower disease risk.

The strongest reason is systematic evidence — several large, multi-year studies (C). A is a single anecdote, B is an appeal to popularity, and D is an irrelevant celebrity (misplaced authority); all are weak support for a general claim.

“In our employee-satisfaction survey, departments that could choose remote work were more satisfied. So if we roll out remote work company-wide, satisfaction should rise.” Which assumption is most essential for this conclusion?

Correct: B) The higher satisfaction was due to remote work itself, not to other features of those departments (like the type of work).

To claim rollout will raise satisfaction, you must assume the satisfaction came from remote work itself and not from other traits peculiar to those departments (B). If it came from, say, the type of work, company-wide rollout won't help. A would actually weaken the argument, and C and D aren't needed for satisfaction specifically to rise.

A town installed security cameras, and the next year crime in that district fell. That same year, the neighboring district (with no cameras) saw crime fall by about the same amount. What is the most defensible inference about the cameras?

Correct: D) Since both districts fell by about the same amount, the drop may be due to a common factor other than the cameras, and the cameras' effect can't be confirmed from this data.

If the camera-free neighbor fell by about the same amount, the drop likely stems from a townwide common factor (economy, another measure), so the cameras' specific effect isn't shown here (D). Claiming it's 'proven' (A) ignores that the comparison group undercuts it; 'no effect whatsoever' (B) overstates the other way; and C dismisses the inconvenient data.

“This policy is right, because a trustworthy expert says so. And why is that expert trustworthy? Because he supports this correct policy.” What is the main flaw?

Correct: C) It runs in a circle, using the conclusion as its own support (circular reasoning).

The policy is right because the expert is trustworthy, and the expert is trustworthy because the policy is right — the argument uses the very conclusion it's trying to prove as its support, forming a loop. That's circular reasoning / begging the question (C). It isn't hasty generalization (A), a red herring (B), or a slippery slope (D).

Consider the claim “the city should remove the old parking lot to build a new park,” weighing reasons for and against. Which is the weightiest (potentially decisive) objection?

Correct: A) That lot is essential for emergency transport to the nearby hospital, there's no alternative site, and removing it could delay emergency response.

The weightiest objection shows removal would cause a serious, concrete harm — delayed emergency response — with no alternative (A), a strong consideration that can be weighed directly against the benefit (a park). B is a weak minority preference, C is an ad hominem, and D is an appeal to tradition (status-quo fallacy) — none is decisive.

“This road leads to the station, so let's hurry.” What must the speaker be taking for granted for this to make sense?

Correct: C) We want (or need) to go to the station.

The conclusion 'so let's hurry' only makes sense if we actually want or need to reach the station (C); if we didn't, there'd be no reason to hurry. A is not stated, B doesn't follow from 'this road leads there', and D isn't claimed — none of these is the assumption the argument depends on.

“I asked three people leaving this restaurant, and all three had ordered ramen.” From this alone, what can be said most defensibly?

Correct: B) At least these three people ordered ramen.

The only thing established is that the three people asked ordered ramen (B). Concluding anything about the whole restaurant — 'sells only ramen' (A), 'most customers' (C), or 'is a ramen restaurant' (D) — from just three people is an unsupported leap from a tiny sample.

“He's criticizing that health method, but he's just a layperson, not even a doctor — so he must be wrong.” What is the flaw in this argument?

Correct: D) It attacks the speaker's status instead of the substance of the claim.

Whether a claim is right should be judged on its content, but this dismisses it because of who said it ('just a layperson'). That's an ad hominem attack (D). A layperson can still be correct. There's no false dilemma (C) or excess of evidence (A) here.

Which is the strongest (most relevant) reason to support the claim “this bridge is safe”?

Correct: A) Last month a professional inspection agency measured its load capacity and it comfortably met the standard.

What most directly supports 'is it safe' is a professional load-capacity inspection (A). Being beloved (B), looking new (C), or not having heard of accidents (D, hearsay / appeal to ignorance) are weak or irrelevant as evidence of structural safety.

“Sales rose after we launched the new ad, so we should increase the ad budget.” What is an unstated assumption this argument depends on?

Correct: B) The rise in sales was mainly due to that ad.

The conclusion 'increase the ad budget' depends on the rise being caused by the ad rather than by, say, seasonality or other actions (B). If that assumption fails, the case for spending more collapses. A, C, and D can all be false while the argument still stands, so they aren't the assumption it depends on.

“A survey found that children who eat breakfast tend to get better grades.” What is the most careful, defensible inference?

Correct: C) There's an association between breakfast and grades, but this alone can't establish cause and effect.

Correlation doesn't imply causation — a third factor (e.g. home environment) could drive both, so this survey alone can't establish cause (C). A assumes causation, D overstates a tendency into 'always', and B reverses the finding — all overreach.

“This supplement really works — after all, tons of people buy it and it's the #1 bestseller.” Which best describes the flaw?

Correct: A) It treats popularity (many people buying it) as proof that it works.

'It sells well, therefore it works' mistakes popularity for evidence of effectiveness — a bandwagon (appeal to popularity) fallacy (A). Sales can be driven by marketing or price and don't guarantee efficacy. No expert authority (B), topic shift (C), or false dilemma (D) is used.

Which is the most effective objection to the claim “this town should build a new library”?

Correct: D) The town already has three libraries, and data shows all of them are underused.

The strongest objection is data showing the town already has enough libraries with low demand (D) — it directly undercuts the need for a new one. A is an ad hominem against the proposer, B merely notes mixed opinions, and C is a vague prediction — all weak as objections.

“This machine will surely run fine, because the daily inspection found no problems.” What must be assumed for this to hold?

Correct: D) Any problem not caught by the inspection cannot occur (the inspection catches every possible fault).

To move from 'no problem found' to 'surely runs fine' you must assume the inspection detects every possible fault, with no misses (D). If it can miss faults, a problem could still lurk. A, B, and C could all be false without changing the logic, so they aren't the required assumption.

“This year, in this region both umbrella sales and ice-cream sales rose sharply over last year.” What can be concluded?

Correct: A) Nothing beyond the fact that both umbrella and ice-cream sales rose can be concluded from this alone.

Two figures both rising doesn't reveal the reason (population growth, the economy, weather — many are possible), so the careful conclusion is just the fact itself (A). B mistakes correlation for causation, C is baseless, and D guesses at weather not given in the premise — all are leaps.

“If you don't support my proposal, then you don't want this team to succeed.” What is the flaw?

Correct: B) It makes it look like the only options are 'support it' or 'not want success'.

One can oppose the proposal yet want the team to succeed (e.g. prefer a better plan), but the argument narrows it to just two options. That's a false dilemma (B). It isn't an ad hominem (C), circular reasoning (D), or hasty generalization (A).

Which is the strongest reason supporting the claim “walking 30 minutes a day is good for your health”?

Correct: C) Several studies tracking tens of thousands of people over years found regular daily walking associated with lower disease risk.

The strongest reason is systematic evidence — several large, multi-year studies (C). A is a single anecdote, B is an appeal to popularity, and D is an irrelevant celebrity (misplaced authority); all are weak support for a general claim.

“In our employee-satisfaction survey, departments that could choose remote work were more satisfied. So if we roll out remote work company-wide, satisfaction should rise.” Which assumption is most essential for this conclusion?

Correct: B) The higher satisfaction was due to remote work itself, not to other features of those departments (like the type of work).

To claim rollout will raise satisfaction, you must assume the satisfaction came from remote work itself and not from other traits peculiar to those departments (B). If it came from, say, the type of work, company-wide rollout won't help. A would actually weaken the argument, and C and D aren't needed for satisfaction specifically to rise.

A town installed security cameras, and the next year crime in that district fell. That same year, the neighboring district (with no cameras) saw crime fall by about the same amount. What is the most defensible inference about the cameras?

Correct: D) Since both districts fell by about the same amount, the drop may be due to a common factor other than the cameras, and the cameras' effect can't be confirmed from this data.

If the camera-free neighbor fell by about the same amount, the drop likely stems from a townwide common factor (economy, another measure), so the cameras' specific effect isn't shown here (D). Claiming it's 'proven' (A) ignores that the comparison group undercuts it; 'no effect whatsoever' (B) overstates the other way; and C dismisses the inconvenient data.

“This policy is right, because a trustworthy expert says so. And why is that expert trustworthy? Because he supports this correct policy.” What is the main flaw?

Correct: C) It runs in a circle, using the conclusion as its own support (circular reasoning).

The policy is right because the expert is trustworthy, and the expert is trustworthy because the policy is right — the argument uses the very conclusion it's trying to prove as its support, forming a loop. That's circular reasoning / begging the question (C). It isn't hasty generalization (A), a red herring (B), or a slippery slope (D).

Consider the claim “the city should remove the old parking lot to build a new park,” weighing reasons for and against. Which is the weightiest (potentially decisive) objection?

Correct: A) That lot is essential for emergency transport to the nearby hospital, there's no alternative site, and removing it could delay emergency response.

The weightiest objection shows removal would cause a serious, concrete harm — delayed emergency response — with no alternative (A), a strong consideration that can be weighed directly against the benefit (a park). B is a weak minority preference, C is an ad hominem, and D is an appeal to tradition (status-quo fallacy) — none is decisive.