Adaptive radiations can be a direct consequence of four of the ...

[penguins]

Adaptive radiations can be a direct consequence of four of the following five factors. Select the exception.
A) vacant ecological niches
B) genetic drift
C) colonization of an isolated region that contains suitable habitat and few competitor species
D) evolutionary innovation
E) an adaptive radiation in a group of organisms (such as plants) that another group uses as food

[Millan]

I know it's B, we did this yesterday

[penguins]

Thank you, thank you!!