B is incorrect. The answer is D the topic.
In part two of Trifles, the statement that best supports the feminist theme that women often found it difficult to fulfill their own heart’s desires is that (B) the implication that a young Mrs. Peters was discouraged from saving her childhood pet from a vicious little boy.
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This part of the essay represents A, the support. The key phrase is "Another similarity....", which shows us that this paragraph is one of the evidences to support the thesis.