OG详解-OG5 文法 Q12

Choice A is the best answer. The sentence identifies the novel’s real author, explaining that Mary Ann Evans published the novel under the pseudonym of George Eliot.
Choice B is incorrect. The sentence explains that George Eliot was assumed to be a pseudonym; it doesn’t identify the novel’s real author. Choice C is incorrect. The sentence specifies the pseudonym used on the novel’s title page; it doesn’t identify the novel’s real author. Choice D is incorrect. While the sentence indicates that the novel’s real  author used a pseudonym, it doesn’t identify that author as Mary Ann Evans.