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@sprozes, Lines 4-7 define grand theories, such as Freudianism, as "intellectual movements" that "attempt to account for a broad range of historical phenomena with a single ambitious explanation." (D) is a paraphrase of these lines.

I understand that D adheres to the definition, but isn't A a more specific answer?

Also confused about this, A is just a restatement of lines 9-11 that specifically talk about Freudianism and its features that make it fit a "grand theory".