A vs C

@awashing the flaw here is combining two things because they share the necessary condition in common. "There are circumstances in which it is not immoral to make certain threats . . . " Sometimes: MCT ==> not IM " . . . there are circumstances in which it is not immoral to ask for money or some other favor." Sometimes: A4MorOF ==> not IM The conclusion is, "there are circumstances in which it is not immoral to ask for money or a favor while making a threat." Sometimes: A4MorOF & MCT ==> not IM How can we combine these two? Just because they share the necessary condition, doesn't mean they can be combined. (A) is not the same flaw as (A) is concluding that if neither a business event nor a social event, casual dress is not likely to be appropriate. (C), on the other hand, is the exact same flaw. "It is healthful to take drug A for headache . . ." DA4H ==> H ". . . it is healthful to take drug B for headache." DB4H ==> H The conclusion is, "it is healthful to take drug A together with drug B for a headache." DA4H & DB4H ==> H Therefore, (C) would be the correct answer. Hope that helps! Please let us know if you have any other questions.

How did you know that not immoral would be the necessary condition and not the sufficient?

@Mehran, is E incorrect because it is combining two things because they share the sufficient condition in common? (As opposed to combining two things because they share the necessary condition, as the passage & answer choice C both do?)

@wills and @JeremyG, Great questions. @wills, We know that 'not immoral' is in the necessary condition because of the way the sentences are structured. "There are circumstances in which it is not immoral to make certain threats" This means that sometimes making certain threats isn't immoral. Based on this structure, we know that 'not immoral' goes in the necessary condition since 'sometimes making certain threats' is what is triggering the conditional chain (so 'sometimes making certain threats' goes in the sufficient condition). "There are circumstances in which it is not immoral to ask for money or some other favor" The same holds true for this sentence. Based on this structure, we know that 'not immoral' goes in the necessary condition since 'ask[ing] for money or some other favor' is what is triggering the conditional chain (so 'ask[ing] for money or some other favor' goes in the sufficient condition). @JeremyG, (E) says, "The mountain roads are treacherous after it rains, and the mountain streams are full after a rain. So, if the roads in the mountains are treacherous, and the mountain streams are full, it surely has rained recently." The problem with (E) is that it's the wrong type of flaw. (E) confuses sufficient and necessary conditions for each other. Raining is a sufficient condition for making treacherous mountain roads. It's possible there are other sufficient conditions for making treacherous mountain roads. We need an answer choice that matches the flaw of the stimulus (which is trying to combine two things that share a necessary condition). This is why (E) doesn't work. Does this make sense? Let us know if you have any more questions!