Explanation
Correct answer: B.
Choice B is the best answer. Noting that the evidence suggests Indigenous peoples may have found dinosaur remains in 1100 CE, the sentence emphasizes how the 1990 discovery challenged Plot’s reputation as the first person to discover dinosaur remains.
Why the other choices are wrong
Choice A
Choice A is incorrect. While the sentence does emphasize that Benoit challenged Plot’s reputation, it misrepresents information in the notes; Plot was reputed to be the first person to discover dinosaur remains in general, not the first person to discover M. carinatus remains specifically.
Choice C
Choice C is incorrect. The sentence only partially explains the significance of the 1990 discovery, noting that it suggests Indigenous people brought dinosaur remains to the cave in 1100 CE; it doesn’t explain the discovery’s significance to Plot’s reputation.
Choice D
Choice D is incorrect. While the sentence does emphasize that the discovery challenged Plot’s reputation, it misrepresents information in the notes. The notes don’t indicate that the 1990 discovery cast any doubt on Plot’s claims to have found fossilized dinosaur bones; rather, the discovery challenged Plot’s reputation for being the first to discover dinosaur bones.