I'm going to rehash this
weaken question because, in my opinion, the stimulus is fairly confusing and I want to make sure I understand the structure of the question.
Each vaccine is administered to a patient only once; other medicines are administered many times
(→)
Sales of vaccines are likely to be lower
(→)
Marketing of vaccines = less profitable than any other pharmaceutical product
→
The development costs for new vaccines should be subsidized by the govt.
It is absolutely essentially to note that I only lay this argument out for my own benefit of seeing the structure. Most of this argument (the stuff in orange) is
absolutely irrelevant for the purposes of this question. Why? Because the stem is asking us to do one thing:
weaken the
support offered for the claim concerning "Marketing of vaccines = less profitable than any other pharmaceutical product." Now this does not mean completely ignore everything else. I think you should try to understand the structure but I think the meat of what we are being asked about is just our main focus and, if no answer choices look correct, we may broaden our scope.
Each vaccine is administered to a patient only once; other medicines are administered many times
→
Sales of vaccines are likely to be lower
So what is the gap here? This is a weaken question so let's analyze what it could be. Now notice in the stimulus that we are comparing "vaccines" vs. "medicines that combat diseases and chronic illnesses." Thinking about this, we might ask ourselves "well just because it is administered only once does NOT mean that the sales are going to be lower. Maybe more people get vaccines." I mean, keep in mind that we are talking about the likes of "chronic illnesses" and such! How many people get the flue vaccine? How many people get treatment for AIDS or cancer or whatever. This is important because IF we know something about how many people get these vaccines THEN we might be able to say to the author, "whoa now! # of administrations doesn't matter nearly as much as how many people receive them!"
(A) gives us exactly that. If the vaccines are administered to many more (not just more; many more), then we might be able to say that the conclusion doesn't really follow. As for the earlier question, you are totally right! We don't know that these vaccines are going to be more profitable due to what happens with "most other pharmaceutical products." HOWEVER, this is a weaken question, not a sufficient assumption question. We don't need to KNOW anything but rather just introduce a reasonable shadow of doubt. And by the way, "most" is a very common word on correct strengthen/weaken answer choices.
(B) This actually has nothing to do with the support, the meat of what we are talking about. This just says that vaccines and medicines can sometimes do the same thing yet this speaks nothing to the number of people receiving the vaccinations or how often they are administered.
(C) Great but this is irrelevant. We are comparing vaccines vs. medicines so we can move along.
(D) Also completely irrelevant. We are talking about Rexx here.
(E) This says that the companies that manufacture the vaccine rarely have to pay the cost of administration. However, are actually more concerned about the sales of the product here (that is what the support we are trying to undermine is related to). Profitability is certainly being discussed in (E) but it just simply doesn't talk about the sales.
Hope that helps!