Which of the Following Best Describes What Happened to the Dinosaurs

Which of the following best describes what happened to the dinosaurs about 65 million years ago?

A) A large asteroid impact resulted in global climatic change and the death of the dinosaurs.
B) A large solar flare quickly raised Earth's temperature to the point where dinosaurs couldn't survive.
C) A massive volcanic eruption resulted in global cooling, which killed the dinosaurs.
D) The extinction of the dinosaurs 65 million years ago remains a great mystery to scientists.
E) More intelligent mammals began to evolve and competed for limited food resources, ultimately causing dinosaurs to go extinct