What Is a Likely Reason the Cretaceous Extinction About 65

What is a likely reason the Cretaceous extinction about 65 mya is the best studied mass extinction?

A) It is the most recent mass extinction. Therefore, the fossils are typically closer to the surface and more easily reached for study.
B) It was by far the most far-reaching extinction and most interesting extinction event because it killed everything in the oceans.
C) It was the mass extinction farthest back in time, and it gave rise to the Cambrian explosion.
D) It was the mass extinction event that killed off all of the animals and plants that arose during the Cambrian explosion.