Booker T Washington Made the Statement "The Indian Refused to Submit

Booker T. Washington made the statement "the Indian refused to submit and to learn the white man's ways. The result is that American Indians have disappeared. The Negro, wiser and more enduring than the Indian, patiently endured slavery [and therefore has] a civilization vastly greater than that of the Indian." This statement reflects Washington's belief(s) that

A) the people of both of these groups survived only to the extent that they fulfilled the economic needs of the society.
B) slavery had been mostly beneficial for the slaves.
C) Blacks were inherently superior to American Indians.
D) All of these answers are correct.