(A) offers information that could provide a reason why critics claim Colette’s novels don’t address important moral questions, but we don’t care about the critics. Their motives do not affect whether or not Colette’s novels address these questions.

If (B) is not true, and books that poetically condense major emotional crises don’t care about those crises, then the critics are correct, and Colette’s books are indifferent to the moral questions they raise.

We don’t know if Colette deserves the praise she has received, so this doesn’t affect our argument. In any case, it’s far too strong of an answer, as we don’t care about novelists other than Colette.

The information about the language Colette uses is purely contextual and entirely irrelevant to the argument. This answer choice doesn’t connect this already-useless information to the argument in any way, so it is not necessary.

We do not care about what purposes Colette had for the way she wrote her novels, if any. And even if she didn’t intend for her novels to explore important moral questions, it’s possible they did anyway.