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I took Prep Test 57 today, and on Section 3, the second LR section, #24, I chose C and the answer listed in the back was D.

I honestly don't think this is right. It was the question regarding a sea animal having a heart or not, looking for a sufficient assumption to prove the conclusion.

If someone can tell me why I'm wrong, that'd be great, or if someone can confirm my suspicion that this is a misprint in the book. Thanks

This question asks which choice should be assumed in order for the argument’s conclusion to follow logically. The argument claims that a certain vessel is a heart because its structure and actions closely resembles those of other animal hearts. Therefore, (C) is the credited response.

Yeah, it's a misprint. Confirmed here:
http://lsatblog.blogspot.com/2010/04/ls ... -exam.html

Thanks a lot