The Mass Extinction Event 65 Million Years Ago in Which

The mass extinction event 65 million years ago in which the dinosaurs went extinct is believed to have been caused by a large asteroid striking Earth. Evidence in support of this hypothesis includes the discovery of material common to asteroids within a layer of Earth that dates to the time of the extinction. In addition, a large crater was discovered with the expected date and size of such an asteroid impact. The fossil record indicates there were four other mass extinction events. Which of the following experimental results support(s) a hypothesis that all mass extinction events were caused by asteroid strikes?

A) Craters of various sizes are present throughout the fossil record.
B) Deposits of volcanic ash correlate with other indicators of major climate shifts.
C) Layers of Earth that date to the time of each mass extinction event contain the material common to asteroids.
D) All of these are correct.