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805+ (Hard)|   Assumption|         
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gemministorm
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 07:13
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conclusion: if p-a-t discontinue -> alumni signup to mentor decline by about 400.
Why? p-a-t results in about 400 alumni signing up to mentor current students.

find the assumption -
A -> argument is not about the cost.
B -> it's not about the able to contact alumni or not.
C -> could be -> if more/a lot would sign-up to mentor via other means then our conclusion does not hold true.
D -> even if more likely, how are they going to contact if p-a-t is discontinued and that is not mentioned in this option.
E -> could be - if other means become more effective at attracting mentors -> but will need further assumption for the alumni to do the mentoring.

Hence going with C.
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 07:24
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A This option is about cost-effectiveness. It's irrelevant to whether the decline would actually be 400.

B It isn't an assumption. It weakens the argument if anything, because maybe email could still get them to sign up.

C Correct. Few of those 400 would sign up through other outreach efforts if phone-a-thon is discontinued. If this is false, maybe all 400 would sign up anyway.

D It's irrelevant. It's about comparing them to other alumni in propensity to sign up, not about whether these specific 400 would sign up if phone-a-thon didn't exist.

E It isn't required. Even if other channels do become more effective, maybe they would attract different people, not these same 400.


IMO C
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 07:28
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A) Irrelevant, we are not concerned with the cost of the phone a thon
B)Even if the uni is being able to contact, we don't know how many will actually sign up or not. Incorrect
C) Negating it, Uni's other channels will become more effective at attracting mentors, but we dont know how many will actually sign up. Incorrect
D)Negating it, alumni who actually sign up through a phone a thon are more likely to sign up through any way they are contacted, yet we still dont know whether the 400 people or how many people will sign up or not. Incorrect
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 07:34
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Bunuel
Each spring, Northbridge University runs a weeklong alumni phone-a-thon. In a typical year, the phone-a-thon results in about 400 alumni signing up to mentor current students. Therefore, if the university were to discontinue the phone-a-thon, the number of alumni who sign up to mentor students each year would decline by about 400.

Which of the following is an assumption on which the argument depends?

A. The phone-a-thon costs the university less than the value of 400 alumni mentors’ time.
B. The university would still be able to contact alumni through email if the phone-a-thon were discontinued.
C. Few alumni who currently sign up to mentor through the phone-a-thon would sign up through other university outreach efforts if the phone-a-thon were discontinued.
D. The alumni who sign up to mentor through the phone-a-thon are not substantially more likely than other alumni to sign up to mentor in any given year, regardless of how they are contacted.
E. The university’s other mentoring sign-up channels would not become significantly more effective at attracting mentors if the phone-a-thon were discontinued.

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A. Incorrect : Irrelevant to the conclusion. We are not bothered by costs. Eliminate.

B. Incorrect : This is a weakner and not an assumption. Eliminate.

C. Correct : The author is assuming that the alumi sign up only via phone-a-thon. They won't use any other outreach methods.

D. Incorrect : They don't have to be more likely. They can be equally likely to or less likely than other alumi. Hence, this is not an assumption for the conclusion to hold true.

E. Incorrect : Even if they become more effective, the author doesn't assume this. They may still be able to get about 400 registrations.

Option C
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 07:43
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A -> The time value comparison is not the assumption required for the argument to stand
B -> This assumption is not mandated for the argument to stand. Negation does not result in any issues with the argument
C -> Correct, If few of the 400 alumni would sign up if the phone-a-thon is not done then the argument needs this assumption as it concludes by saying that about a reduction of 400 is expected.
D -> The passage focuses on the phone-a-thon alumni invitations
E -> This doesn't compare other channels and their attractiveness.

Option C
Bunuel
Each spring, Northbridge University runs a weeklong alumni phone-a-thon. In a typical year, the phone-a-thon results in about 400 alumni signing up to mentor current students. Therefore, if the university were to discontinue the phone-a-thon, the number of alumni who sign up to mentor students each year would decline by about 400.

Which of the following is an assumption on which the argument depends?

A. The phone-a-thon costs the university less than the value of 400 alumni mentors’ time.
B. The university would still be able to contact alumni through email if the phone-a-thon were discontinued.
C. Few alumni who currently sign up to mentor through the phone-a-thon would sign up through other university outreach efforts if the phone-a-thon were discontinued.
D. The alumni who sign up to mentor through the phone-a-thon are not substantially more likely than other alumni to sign up to mentor in any given year, regardless of how they are contacted.
E. The university’s other mentoring sign-up channels would not become significantly more effective at attracting mentors if the phone-a-thon were discontinued.

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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 07:44
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answer C

passage assumes that if discontinued that the people that would have signed up will not find another way to sign up
Bunuel
Each spring, Northbridge University runs a weeklong alumni phone-a-thon. In a typical year, the phone-a-thon results in about 400 alumni signing up to mentor current students. Therefore, if the university were to discontinue the phone-a-thon, the number of alumni who sign up to mentor students each year would decline by about 400.

Which of the following is an assumption on which the argument depends?

A. The phone-a-thon costs the university less than the value of 400 alumni mentors’ time.
B. The university would still be able to contact alumni through email if the phone-a-thon were discontinued.
C. Few alumni who currently sign up to mentor through the phone-a-thon would sign up through other university outreach efforts if the phone-a-thon were discontinued.
D. The alumni who sign up to mentor through the phone-a-thon are not substantially more likely than other alumni to sign up to mentor in any given year, regardless of how they are contacted.
E. The university’s other mentoring sign-up channels would not become significantly more effective at attracting mentors if the phone-a-thon were discontinued.

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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 07:50
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This might have been the only that didn't give me too much trouble today :P It'd be a shame if I got this wrong ;)

Northbridge University's phone-a-thon generally results in 400 alumni signing up for mentorship. This doesn't mean the phone-a-thon is the only medium to encourage registrations, but it is definitely responsible for 400 of those (usually).

Hence, the conclusion states that discontinuing the phone-a-thon will lead to a decline by about 400 registrations.

Now, this reduction will only be possible if another method / replacement method doesn't compensate for the reduction in registrations. That's what we're looking for in an assumption.

Option A: Even if the phone-a-thon costs more than the value of alumni mentors' time, we're judging whether the 400 registrations will reduce or not. Eliminate.

Option B: If a channel of communication exists, then it might be possible to compensate for the purported decline of 400. However, this isn't a necessary assumption. Eliminate.

Option C: This is definitely necessary. If methods that replace phone-a-thons also fail, then the decline of 400 is a definite guarantee.

Option D: This compares mentors registered through the phone-a-thon with other mentors, which isn't the point of the argument. Eliminate.

Option E: Even if other mentoring sign-up channels become significantly more effective, that may impact the decline, but it isn't a guarantee. Hence, C is still better. Eliminate.



Bunuel
Each spring, Northbridge University runs a weeklong alumni phone-a-thon. In a typical year, the phone-a-thon results in about 400 alumni signing up to mentor current students. Therefore, if the university were to discontinue the phone-a-thon, the number of alumni who sign up to mentor students each year would decline by about 400.

Which of the following is an assumption on which the argument depends?

A. The phone-a-thon costs the university less than the value of 400 alumni mentors’ time.
B. The university would still be able to contact alumni through email if the phone-a-thon were discontinued.
C. Few alumni who currently sign up to mentor through the phone-a-thon would sign up through other university outreach efforts if the phone-a-thon were discontinued.
D. The alumni who sign up to mentor through the phone-a-thon are not substantially more likely than other alumni to sign up to mentor in any given year, regardless of how they are contacted.
E. The university’s other mentoring sign-up channels would not become significantly more effective at attracting mentors if the phone-a-thon were discontinued.

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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 07:55
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Let's check each option one by one =>
A => The cost for the phone-a-thon is irrelevant. Eliminate.
B=> This undermines the conclusion as phone-a-thon is not necessary for the alumni to join. Eliminate.
C=> The word 'Few' tells that only a small number of alumni will join via other outreach programs and cements the necessity of phone-a-thon. Keep for now.
D=> This compares inherent likelihood and not the contact method. Eliminate.
E=> The effectiveness of other channels is related but broader and not direct. Eliminate.

C is the correct answer.
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 08:00
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A The costs of phone-a-thon are irrelevant to predicting the decline.

B Contacting alumni by email doesn't address whether sign-ups would still happen.

C Right answer. This directly supports the conclusion and is required. The argument depends on the idea that the phone-a-thon is the main reason those 400 people sign up.

D This weakens rather than supports the argument.

E It's not strictly required. If they stayed the same, the argument could still fail without C.


Answer C
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 08:09
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Evidence : Currently about 400 alumni sign up to be mentors during a specific weeklong phone - a thon.
Conclusion : If the University stops the phone a thon , total number of mentors will decline exactly by same amount(400).

The Logical gap :
The author assumes that the phone a thon is the only way these 400 people would ever sign up.
For Example : If you usually buy something for somewhere because the barista calls your name , but that barista quits . Will you quit buying it or order it via app or other barista instead.
A : (Cost ) : The Cost of the program is irrelevant to the number of people signing up.❌
B : (Ability to contact ) : Just because the uni can contact them via email , doesn't mean alumni will actually sign up that way.❌
C : If C is true : The argument works . If these 400 people are people only sign ups and won't use email or website then losing it will cause 400 person drop.
If C is false : If many of those 400 people sign up via email or other measures. The total number of mentors would not decline by 400 , The conclusion falls apart.✅
D & E : These are talking about other alumni or effectiveness of other channels , but the core of the argument is specifically about the 400 people who are currently using the phone a thon.❌
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 08:17
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About 400 join because of phon-a-thon. If phon-a-thon were discontinued, about this many would not join the mentors program.
This means that about 400 mentors join the program only because they are called during the campaign. They would most probably not join if not called.

A - Cost of the event is not the consideration but if sign-up would decline on discontinuing the event, hence no
B - Contacting doesn't mean that the alumni would join as number of declines is the about the same who join through phon-a-thon, hence no
C - Few will sign-up through other methods if the event is discontinued. This means that most join because of the phon-a-thon event. This is correct assumption.
D - This gives the comparison on how likely are the alumni to join when different channels of communication are considered and not the assumption that about the same number will declines which join when event is held, hence no
E - The argument doesn't need to access whether other channels will remain the same or become more effective. This does not access the reason for the same number of decline in number. Hence no.

Hence, Answer will be C
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 08:18
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The argument's assumption is that these 400 alumni would not sign up through any other medium or program if phone-a-thon is discontinued.

A. This choices talks about cost-benefit analysis. Irrelevant.

B. This choice might actually strengthen the argument but its not the necessary assumption.

C. This is interesting. Negating this choice tells us the net decline would be far less than 400. Keep.

D. This choice talks about the likelihood of mentors. It's confusing and doesn't directly break the conclusion.

E. This is also interesting. If other channels become more attractive then discontinuing phone-a-thon might not have an impact at all. This seems to be the correct answer.

Choice E

Bunuel
Each spring, Northbridge University runs a weeklong alumni phone-a-thon. In a typical year, the phone-a-thon results in about 400 alumni signing up to mentor current students. Therefore, if the university were to discontinue the phone-a-thon, the number of alumni who sign up to mentor students each year would decline by about 400.

Which of the following is an assumption on which the argument depends?

A. The phone-a-thon costs the university less than the value of 400 alumni mentors’ time.
B. The university would still be able to contact alumni through email if the phone-a-thon were discontinued.
C. Few alumni who currently sign up to mentor through the phone-a-thon would sign up through other university outreach efforts if the phone-a-thon were discontinued.
D. The alumni who sign up to mentor through the phone-a-thon are not substantially more likely than other alumni to sign up to mentor in any given year, regardless of how they are contacted.
E. The university’s other mentoring sign-up channels would not become significantly more effective at attracting mentors if the phone-a-thon were discontinued.

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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 08:22
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A Not necessary for the argument. This is about cost-benefit to the university, not about whether the drop would be 400.

B If they could contact alumni through email, that might actually debile the argument.

C If most of the 400 would not sign up otherwise, then discontinuing the phone-a-thon would indeed cause a drop of about 400. Correct answer.

D The argument is about these specific 400, not about how likely they are relative to others.

E This might strengthen the argument, but it's not required.


The answer is C
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 08:28
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The argument goes like this: we get 400 alumni to mentor through phone-a-thon => without the phone-a-thon, we'll get 400 mentors fewer.
For this logic to work, the assumption is such that those people who agree throgh the calls would not alternatively agree to join the mentoring program.

A) Costs are out of scope of the argument.
B) Email is only one of other possibilities, and the argument focuses on the mentoring that follows, not just the communicating stage.
C) Looks good, since it shows that only few of the phone-a-thon mentors would consider other ways of joining.
D) Also good, since it mentiones that phone-a-thon mentors are not joining simply because they're so passionate about mentoring.
E) Not too bad, but we don't know how effective they already are, and if not, then even a substantial improvement would have no impact.

Comparing C and D, I'm more inclined to the latter. Let's use negation: (C) not few alumni who mentor from phone-a-thon would sign up; and (D) the phone-a-thon mentors are generally substantially more likely to sign up for mentoring. Indeed, from C, if quite some alumni would sign up through different channels, it may mean that we won't lose all of them without the phone outreach. However, what is 'few' and 'not few', how many is it? and does it mean we'll not lose all 400? Whereas D shows that those phone-called almni are generally eager to be mentors, even if an owl brings a handwritten invitation - and this would probably break the logic of the argument.

Therefore, the answer is D.
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 08:44
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A It's not an assumption. Even if it costs more than it's worth, stopping it could still cause a 400-drop.

B The argument does not assume this, it assumes the opposite, alternative methods won't get those same 400.

C CORRECT. If false, most of them would sign up anyway, then stopping phone-a-thon wouldn't drop sign-ups by 400.

D Even if they were more inclined to sign up to mentor, maybe they still wouldn't sign up without the phone-a-thon.

E Even if other channels do improve overall, maybe they don't attract these 400 but other people.


The correct answer is C
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A. Irrelevant as this isnt talking about the number of mentors but the general cost benefit, which isnt a requirement for the conclusion
B. Irrelevant as even if they contact alumni via emails, signup guarantees arent mentioned at all
C. Relevant as this directly states that the 400 are dependent on the phone-a-thon and only a few would signup if the outreach mode were to change. So this assumption is a necessity here.
D. Not as irrelevant since it talks generally and not about the situation if phone-a-thon were to dissapear. The argument would still hold without this statement
E. Not as irrelevant since the argument doesent need other channels to stay weak, it only needs most of the 400 to depend on the phone-a-thon

C
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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 20 Dec 2025, 08:59
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Context: NBU runs a yearly alumni phoneathon to recruit mentors to students

Premise: Ina given year, the phonethon results in about 400 alumni signing up for mentorship

Conclusion: If university discontinues the phonethon, number of alumni who sign up as mentos would decline by about 400
Logical gao: 400 alumni signup because of phonethon would not sign up though other means

A) This is about cost benefit, not hwhether numbers would decline
B) This is not a must be true condition
C) correct. It bridges the logical gap. Ensures that 400 mentors are caused by phonethon
d) THIS IS A WEAKENER. if they discontinue anyway, then discontinuing phonwethon wont reduce mentors
e) we do not know about this.

C is answer
Bunuel
Each spring, Northbridge University runs a weeklong alumni phone-a-thon. In a typical year, the phone-a-thon results in about 400 alumni signing up to mentor current students. Therefore, if the university were to discontinue the phone-a-thon, the number of alumni who sign up to mentor students each year would decline by about 400.

Which of the following is an assumption on which the argument depends?

A. The phone-a-thon costs the university less than the value of 400 alumni mentors’ time.
B. The university would still be able to contact alumni through email if the phone-a-thon were discontinued.
C. Few alumni who currently sign up to mentor through the phone-a-thon would sign up through other university outreach efforts if the phone-a-thon were discontinued.
D. The alumni who sign up to mentor through the phone-a-thon are not substantially more likely than other alumni to sign up to mentor in any given year, regardless of how they are contacted.
E. The university’s other mentoring sign-up channels would not become significantly more effective at attracting mentors if the phone-a-thon were discontinued.

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12 Days of Christmas GMAT Competition 2025 - Day 5: Each spring, North 21 Dec 2025, 02:26
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Actually Option - C is negatively affecting the conclusion. If the 400 phone-a-thon registered through other routes, then the no. of alumni would not decline by about 400
Bunuel
Each spring, Northbridge University runs a weeklong alumni phone-a-thon. In a typical year, the phone-a-thon results in about 400 alumni signing up to mentor current students. Therefore, if the university were to discontinue the phone-a-thon, the number of alumni who sign up to mentor students each year would decline by about 400.

Which of the following is an assumption on which the argument depends?

A. The phone-a-thon costs the university less than the value of 400 alumni mentors’ time.
B. The university would still be able to contact alumni through email if the phone-a-thon were discontinued.
C. Few alumni who currently sign up to mentor through the phone-a-thon would sign up through other university outreach efforts if the phone-a-thon were discontinued.
D. The alumni who sign up to mentor through the phone-a-thon are not substantially more likely than other alumni to sign up to mentor in any given year, regardless of how they are contacted.
E. The university’s other mentoring sign-up channels would not become significantly more effective at attracting mentors if the phone-a-thon were discontinued.

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