Most Dinosaurs Became Extinct at the End of Which of the Following

Multiple Choice

Most dinosaurs became extinct at the end of which of the following periods of the Mesozoic?

A) Jurassic
B) Cretaceous
C) Devonian
D) Triassic
E) Permian Dinosaurs first appeared during the Triassic period and flourished during the Jurassic period; then most became extinct at the end of the Cretaceous period, marking the end of the Mesozoic era.