Favorable mention of their products in the magazine’s articles is of less value to the advertisers than is the continued effectiveness of
Why this is right
This answer is somewhat surprising. Initially when I saw the conclusion, I was thinking that we would have to define, in our correct answer, what exactly is "against their interests" (the advertisers' interests). After all, getting their products favorably mentioned in articles seems very in line with their interests. But then since the premises began "to remain an effective advertising vehicle", I dropped that issue, thinking, "Well clearly the advertisers want this magazine to remain an effective advertising vehicle; otherwise they couldn't keep advertising in this magazine". This answer choice is addressing the possibility that maybe the advertisers will be fine with that. They're currently advertising in Magazine X, and it's an effective vehicle. If they pressure X to write favorably of their products in X's articles, then that will help the advertisers in the short term (more sales, potentially), but it will hurt the editorial credibility and effectiveness of X as an advertising vehicle in the long run. Still, from the advertiser's point of view that could be fine. Maybe they're okay getting the short-term sales boost from having Magazine X sell out and shill their products, and if/when that causes Magazine X to no longer be respected enough to be effective at advertising, then the advertisers will just pull their business and go find a new magazine that hasn't sold out its credibility yet. If we negate this answer, it's saying "favorable mention is of at least as much value to the advertisers as would be the continued effectiveness of the magazine as an advertising vehicle." That would badly weaken the argument, by making it seem like "yielding to their wishes would not be against their interests". Here's a sample argument by analogy: "Jimmy shouldn't push the boss to give him a promotion, because if he succeeds it will actually go against his interests. After all, people who get promoted become much less liked by their coworkers." This argument is assuming that "Jimmy's desire for the promotion is of less value to him than is the continued fondness his coworkers have for him".
Skill tested: Necessary Assumption · how this choice captures the argument's function is the move to repeat next time.