According to Fossil Records,mammals

According to fossil records,mammals

A) first appeared in the same geologic era, the Mesozoic, as dinosaurs.
B) None of the answer choices are correct.
C) first appeared in the current Quaternary period of the Cenozoic era.
D) did not appear until the Cenozoic era, after dinosaurs were extinct.
E) lived in the same era, the Paleozoic, as reptiles, amphibians, and bony fishes.