Sometimes. Medium level questions can be trickier than hard ones
Although the school would receive financial benefits if it had soft drink vending machines in the cafeteria, we should not allow them. Allowing soft drink machines there would not be in our students' interest. If our students start drinking more soft drinks, they will be less healthy.
Premise, If our students start drinking more soft drinks, they will be less healthy.
Conclusion: We should not allow soft drink vending machines.
Let's go from E to A.
(E) The school's primary concern should be to promote good health among its students.
Primary or not primary, the concern is...We don't care about what should or shouldn't be the concern. This option deviates us from the aim of the argument. The Aim is to analyse the impact of soft drink vending machines, not what should be the concern of the school.
(D) Students will not simply bring soft drinks from home if the soft drink vending machines are not placed in the cafeteria.
I initially chose this answer and was wrong, and seeing nearly 25% of the students chose this, definitely means that this is tricky and a confusing choice.
Now here you see, this very well caters the conclusion. Is well within the scope of the argument. but the problem here is that it might be a strengthener, but its not an assumption. (All assumptions are strengtheners, but not all strengtheners are assumptions).
Let's apply the negation test.
Students will bring soft drinks from home if the vending machine is not installed.
Let's go step by step.
Point 1. Even if they bring, what makes us this think that this will be increased to the level that would have been, if the vending machine was there.
Point 2. The Negation doesn't shatter the conclusion. Even if they bring, then also students can buy from vending machines and their levels will increase.
So this point is tricky, but fails.
A Key Learning from this point.
In an Assumption we don't see whether it supports an argument or not/ strengthens the argument or not. But rather are the DEFINITELY required for the argument to stand.
As I said, All assumptions are strengtheners, but not all strengtheners are assumptions.
(C) Students are apt to be healthier if they do not drink soft drinks at all than if they just drink small amounts occasionally.
What is this answer even? Waste of time.
We are concerned about the increase from a certain level.
(B) The amount of soft drinks that most students at the school currently drink is not detrimental to their health.
Bad answer, Opposite.
Negating it. The amount of soft drink that most students at the school currently drink IS DETRIMENTAL to their health.
This Negation is in fact, Strengthening the conclusion.
(A) If the soft drink vending machines were placed in the cafeteria, students would consume more soft drinks as a result.
Yes. This is the answer. Why?
Let's just negate it.
If the soft drink vending machines were placed in cafeteria, students would not consume more soft drink.
Hmm... Now we place 10 New or 1 Million new machines. If the students are self aware of their limits, than placing the vending machine will not be detrimental to health.
So A is the Answer.
Learning, in an assumption question there might be a close choice between a mild strengthener and an assumption. but remember, assumption is something that should MUST Be true in order for an argument to hold... All assumptions are strengtheners, but not all strengtheners are assumptions.