OG详解-OG7 文法 Q12

Choice C is the best answer. The sentence contrasts the two styles of tiles, noting that tiles in the arista style have designs stamped into them, whereas tiles in the majolica style have designs painted directly on them. 
Choice A is incorrect because the sentence indicates that the two styles of tile can be found in the same location; it doesn’t contrast the two styles of tile. Choice B is incorrect because the sentence indicates that the Royal Alcázar of Seville features tiles in both the majolica and arista styles; it doesn’t contrast the two styles of tile. Choice D is incorrect because the sentence indicates that the tilework of the Royal Alcázar of Seville includes tiles in the majolica style; it doesn’t contrast tiles in the majolica style with tiles in the arista style.