I think an analogous argument might help:
All cultures have different definitions of beauty. Still, there are some people that are simply more beautiful than others. However, this beauty must always be considered along with one's personality.
I haven't totally transferred over some of the finer points of the argument, but hopefully the connection is clear to see.
The part in question is analogous to my statement "still, there are some people that are simply more beautiful than others."
Notice two things about this statement --
1. It's a claim (an opinion)
2. According to the author, it's an opinion that must be considered alongside something else (personality).
That's what (C) says -- it's a claim that must be considered in a specific way --
(A) is incorrect in part b/c the author doesn't try to refute the hypothesis
(B) is incorrect in part b/c it is not an objection
(D) is very tempting, but this isn't a claim that is derived from another claim.
(E) is incorrect because the statement is not used to justify evidence.
Hopefully that makes things clearer. This is a tough q, so please let us know if you need any follow up.
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