The affirmative action policies of the 1970s were implemented as a means to help African-American citizens in American society. These policies would help them in several different aspects, including the job market and when applying to colleges. Many American citizens did not like these policies, as they felt that they were being discriminated against and given less opportunity because they were white.
The answer is obviously D. Thousands and thousands of Native Americans were killed for their land by the Europeans and everybody in the world knows that blacks were slaves at one point in history.