Pick the answer that contains an example of adaptive radiation?

AOne population of squirrels becomes two separate species over a long time.
BOne population of lizards leads to 15 separate species over a short time.
COne species of birds becomes better suited to its environment over time.
ETwo species of fish begin to breed with each other.

Verified Answer :

Out of the choices given, the answer that contains an example of adaptive radiation is that one population of lizards leads to 15 separate species over a short time. Adaptive radiation is "rapid diversification of a species in a short amount of time." The correct answer is B.