What Was the Main Purpose of the Race-Evolution Theory

What was the main purpose of the race-evolution theory?

A) To prove that whites were in fact inferior because of their genetic makeup
B) To prove that African Americans were "dangerous to the country in proportion to their numbers"
C) To alert African Americans about the need to demand their political rights, civil rights, and higher education
D) To provide a rational explanation of the unequal distribution of wealth and political power among racial groups