What Economic Effect Works to Eliminate Sex and Race Discrimination

What economic effect works to eliminate sex and race discrimination?

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