The Mass Extinction at the End of the Cretaceous Period

The mass extinction at the end of the Cretaceous period eliminated many forms of organisms, producing ecological opportunities for the evolution of new forms.Which group radiated at this time?

A) Flying reptiles called pterosaurs
B) Giant insects including dragonflies with wingspans of more than 70 centimeters
C) Cephalopod mollusks called ammonites
D) The earliest amphibians
E) Modern and recent forms of mammals