Diversity Through Time Is Represented by the Figure Shown

Diversity through time is represented by the figure shown.Following periods of extinction the total numbers of families of organisms

A) usually recovered within a million years or less,showing remarkable adaptive radiation.
B) usually recovered within about ten million years,and have increased since the beginning of life.
C) usually recovered within about ten million years,indicating the mechanism is probably punctuated equilibrium.
D) usually did not recover at all-the total numbers gradually decline over time.