OG详解-OG10 文法 Q13

Choice C is the best answer. The sentence emphasizes a difference between the portraits, noting that one is a painting and the other is a drawing. 
Choice A is incorrect. The sentence emphasizes a similarity between the two portraits rather than a difference. Choice B is incorrect. The sentence makes a generalization about Enriquez’s portraits; it doesn’t emphasize a difference between theportraits of Jimenez and Anaya. Choice D is incorrect. While the sentence notes a difference between Jimenez and Anaya, it doesn’t emphasize a difference between, or even mention, their portraits.