Which quotation from "Bone Detective" best shows that Diane France is very clever?

A. “If people want to really learn about the soldiers,” she said, “you have to show the bones.”
B. What an impossibly beautiful animal, Diane thought.
C. This, she decided, was one of the coolest things I have ever done.
D. “This guy smoked a pipe,” she explained. “He started on one side and then, when the pipe ground down the teeth, he had to switch to the other.”