parallel reasoning

Hi Supreet1, Our initial argument is as follows: If not both HSD and DC then not EMT (this translates to If EMT-> HSD and DC) THUS: M has both HSD -> M will be EMT. This is an illegal reversal. There could be a bunch of other reasons that M will not be an EMT, perhaps she simply does not want to be one. We are looking for an answer choice with the same structure, and the same illegal reversal.

Isn't it an illegal negation? Since, "if not both HSD and DC" this indicates Sufficient? Therefore, it would be diagrammed as Not HSD and not DC --> Not EMT (contrapositive: EMT --> HSD or DC) Premise: HSD & DC C: EMT This is just negating the principle?

Good point- I think this is an illegal negation- I was writing this from the contrapositive (If EMT-> HSD and DC) in which case it is a reversal, but this does make way more sense to think of as a negation. Thanks!