Stephen Jay Gould's Three "Tiers" of Evolutionary Time Are

Stephen Jay Gould's three "tiers" of evolutionary time are

A) pre-biotic or before-life,prokaryotic life and eukaryotic life.
B) microbial,plant and animal phases.
C) pre-atmospheric,aquatic and terrestrial evolution.
D) not time periods at all,but stabilizing,disruptive and stabilizing evolution processes.
E) not time periods at all,but short-term population genetic processes,intermediate-term speciation and extinction rates,and long-term cycles of mass extinctions.