In other words, the claim is such that pupils don't consume too many snacks at school anyway, so limiting the offering of unhealthy foods available at the cafeteria would do very little to combat increasing obesity.
To cast some doubt on this claim, we need to find support for the importance of snack regulation at school cafeteria, whether it will be driven by disregarding the nutritionist's evidence or by bringing in some new facts.
(A)This is an option that may fit, because forbidding the snacks at school may have an unexpected negative impact on the overall junk food consumption.
Don't eliminate yet.(B)This actually looks like a strengthener, because it offers yet another reason why regulating the cafeteria snacks would do no good.
Eliminate.
(C)This is irrelevant, because it doesn't engage directly with the prompt and the whole concept of snack availability.
Eliminate.
(D)This point has some potential, because it casts some doubt on the validity of research, and the number of consumed cafeteria snacks is actally much higher.
Don't eliminate yet.(E)While this seems like a good point, it actually doesnt contradict anything that the nutritionist said. The stats of about two snacks per week still remain unchanged, and plus, this statement also covers some healthy snacks, so isn't narrow enough to 'help' us.
Eliminate.
So, we are left to choose between options
A and
D.
Personally,
I don't find A convincing enough. Indeed, perhaps pupils will eat some more junk food at home - but as far as the nutritionist is concerned, their bad food consupmtion is already mostly happening at home, so this wouldn't really change the status quo all that much. Basically, this point partially falls into the same framework that the author follows.
However, D directly argues the reserach findings,
undermining the evidence used for the conclusion.
Therefore, for me the right answer is D.