Logically IMHO the answer is B.

I broke it up into "statements" and then did T/F:

FOR "A"
- "The first is a conclusion taht the argument as a whole seeks to refute" = Yes
- "The second is a claim that had been advanced in support of that concluson" = No

FOR "B"
- "The first is a conclusion taht the argument as a whole seeks to refute" = Yes
- "The second is the main conclusion of the argument" = Yes

FOR "C"
- "The first is the main conclusion of the argument" = Definitely Not
- "The second is an objection that has been raised against that argument" = Yes (it's an objection) but No (not to the argument in this answer choice)

FOR "D"
- "The first is the main conclusion of the argument" = Definitely Not
- "The second is a prediction made on the basis of that conclusion" = Definitelly Not, as the second is a refutation

FOR "E"
- "The first is a generalization about the likely effect of a policy under consideration in the argument" = Yes, but likeliness is not certain
- "The second points out a group of exceptional cases to which that generalization does not apply" = No, as the argument is how in *general* the policy won't work

If there's any hole in my reasoning, I welcome comments. As I can benefit from it too.
(Thanks in advance!)
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