The Decimation of American Buffalo Herds in the Late Nineteenth

The decimation of American buffalo herds in the late nineteenth century

A) destroyed the ability of Plains Indians to resist the advance of white settlers.
B) was accelerated by Indian tribes who killed large numbers of buffalo to sell to white Americans.
C) happened almost entirely in the space of a single decade.
D) All the answers are correct.
E) None of the answers are correct.