What Economic Effect Works to Eliminate Sex and Race Discrimination

What economic effect works to eliminate sex and race discrimination?

A) Firms hire only the preferred races and sex.
B) Lower paid races and sexes give up working and drop out of the labor supply.
C) Customers who discriminate pay higher prices to buy from preferred races and sex.
D) The value of marginal product of the less preferred races and sexes eventually increases.
E) Lower paid races and sexes decrease their demand for goods and services.