In Early Evolutionary History,primitive Fishes Had Lungs That Eventually Evolved

Multiple Choice

In early evolutionary history,primitive fishes had lungs that eventually evolved into the lungs of terrestrial organisms and the gas bladders of modern fishes who use gills,not lungs,for oxygen/ carbon dioxide gas exchange.This is an example of

A) adaptive radiation.
B) exaptation.
C) sympatric speciation.
D) allopatric speciation.
E) temporal isolation.