By 1964, Nearly All Blacks Outside the South Were Covered

By 1964, nearly all blacks outside the South were covered by laws that allowed the government to issue cease and desist orders against discriminating firms. According to recent research by William Collins, these laws

A) were successful in improving the wages and working conditions of all African-Americans.
B) were successful in improving the wages and working conditions of only Southern African-Americans.
C) led to lower wages and deteriorating working conditions for African-Americans.
D) had some success in improving the wages and working conditions of African-American women.