Which of the Following Is True

Which of the following is true?

A) Employers who discriminate against blacks and other minorities will have lower costs than rival firms that hire employees strictly on the basis of merit (productivity) .
B) After adjusting for factors such as education, experience, and location, the earnings of black men are almost identical to the earnings of similar white men.
C) If employers can hire equally productive minority employees at a lower wage than non-minorities, the profit motive provides a strong incentive to do so.
D) The empirical evidence indicates that the earnings gap between whites and blacks is entirely the result of employment discrimination.