by ManhattanPrepLSAT1 Mon Dec 05, 2011 9:50 pm
Nice work erin.sparke! I think you got it!
If you don't mind, I'll just chime in with a few other thoughts here. Looking at lines 44-52 an argument about monogamous families that the author of passage B criticizes. That monogamous families would favor the propagation of genes, at least according to the author of passage B, would not allow one to conclude that monogamous families were established in order to propagate genes. If it would, then answer choice (C) would be an assumption underlying that argument. So the author of passage B is undermining the assumption outlined in answer choice (C) - particularly as it represents an assumption of an argument outlined in lines 44-52.
Let's look at the incorrect answer choices:
(A) is not an assumption that the author attacks. And no where is this assumption made, since we do not know that most of the physical features of modern humans would favor the propagation of genes.
(B) is again to too strong since we are not told that these actions would propagate one's genes.
(D) is a distinction that is not addressed by the author of passage B.
(E) is not addressed. The author of passage B does not discuss the extent to which there are behaviors that hinder reproductive success, nor whether the majority of them have been eliminated.
Hope that's helpful for those who might have had a question regarding another of the incorrect answer choices.