In the context of geologic time, which of the following statements best describes when the dinosaurs went extinct (65 million years ago)?
a) The extinction of dinosaurs occurred during the Jurassic Period.
b) The extinction of dinosaurs occurred during the Paleozoic Era.
c) The extinction of dinosaurs occurred at the end of the Mesozoic Era.
d) The extinction of dinosaurs occurred during the Cretaceous Period.