The answer is letter C. Global Mass Extinction
The end of the Mesozoic era was because of the mass
extinction of plants and animals. There were a couple of theories that
explained the mass extinction. There were two theories being supported by many scientists.
They believed that mass extinction could have happen because of the climate
change. Another theory was that extinction happened because there was a meteorite
that had hit the earth and possibly have killed the living creatures due to its
impact.
