OG详解-OG1 文法 Q30

Choice D is the best answer. By indicating that Taylor’s book was the only Civil War memoir published by a Black woman, this sentence emphasizes the uniqueness, or one-of-a-kind nature, of Taylor’s accomplishment.
Choice A is incorrect. While the sentence describes some of Taylor’s accomplishments, it doesn’t emphasize the uniqueness of them. Choice B is incorrect. While the sentence describes some of Taylor’s accomplishments, it doesn’t emphasize that they were unique. Choice C is incorrect. While the sentence provides information about Taylor’s book, it doesn’t emphasize what made the book unique.