OE:
(1) Identify the Question Type
The language if true and calls into question indicate that this is a Weaken question.
(2) Deconstruct the Argument
The argument first establish the fact that buyers of fashion clothing are more likely to purchase from a particular company if that company donates money to charity as a result. As a result, the organizers of a particular event plan to publicize the specific companies that donate a portion of sales revenues to charity. The stated goal is to increase those companies revenues, so the organizers are assuming that informing potential buyers of this fact will cause them to buy more from those particular companies.
(3) State the Goal
The correct answer should Weaken, or make somewhat less valid, the idea that publicizing the charitable companies will cause buyers to buy more from those companies.
(4) Work from Wrong to Right
(A) The cost of producing the flyers is irrelevant to the retailers' revenues. This would be true even if the retailers were paying for the flyers, but this answer choice talks only of the cost for the organizers.
(B) The organizers’ plan is not concerned with why the retailers donate to charity. Rather, it is concerned with whether the charitable retailers will earn more sales as a result of publicizing this fact to buyers.
(C) The relative numbers of retailers who donate to charity and retailers who don’t are irrelevant. The organizers’ plan is to help the retailers that do make donations, regardless of how many such retailers there are.
(D) CORRECT. If the retailers that do make donations have already given the donations heavy publicity, then it is less likely that the flyers will have an impact, as potential buyers might know this information already. This choice directly attacks the organizers' assumption that publicizing the information will cause buyers to change their buying behavior.
(E) The amount or proportion of profits donated to charity by the retailers is irrelevant to the argument. The only distinction made between retailers is between those that donate to charity and those that do not.