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Official Explanation

3. The author’s argument concerning Notre-Dame’s flying buttresses depends on which of the following assumptions about the choir’s lower flyers?

Explanation

The author supports the claim that flying buttresses were present on Notre-Dame from the twelfth century by noting that the choir’s lower flyers feature a chevron decoration that was characteristic of the twelfth century. But since all flyers constructed prior to the fifteenth century have been replaced, the chevron decorations can indicate only that flyers were present in the twelfth century if those decorations accurately reproduce the decorations that existed on the original flyers. Thus, Choice A is the correct answer.

Choice B is incorrect: whether chevron decorations are used only on the exterior is not a point of dispute in the passage. Choices C, D, and E are correct: no part of the argument turns on any claim about the choir’s upper flyers, the nave’s lower flyers, or the sequence in which the choir’s and the nave’s flyers were constructed.

Answer: A