Explanation
Correct answer: B.
Choice B is the best answer because it most logically completes the text’s discussion of noses on ancient sculptures. In this context, "fragile" means weak or delicate. This matches the text’s description of noses on ancient sculptures, which are often missing from sculptures’ heads because they are "especially easy to break." Therefore, this context indicates that noses on ancient sculptures are the most fragile part of the sculptures’ heads.
Why the other choices are wrong
Choice A
Choice A is incorrect. In this context, "recognizable" would mean identifiable. However, the text describes the nose as delicate, protruding, and especially easy to break, which concerns its vulnerability to damage rather than how easily it can be identified.
Choice C
Choice C is incorrect. In this context, "common" would mean frequently occurring. However, the text explains why noses are especially easy to break, so it supports a word describing vulnerability rather than frequency.
Choice D
Choice D is incorrect because the text only indicates that noses on ancient statues often stick out and end up missing from the heads, which doesn’t relate to the noses being "sophisticated," or knowledgeable or refined.