【单选题】

It can be inferred from the passage that which of the following, if possible, would have improved education forAfrican-Americans

A、An increased saturation of the private sector with immigrants
B、The persistence of non-AfricanAmerican ethnic niches in certain sectors of the economy
C、
A、respite from competition found in the immigrant-saturated private-sector
D、
A、decline in the number of apparel manufacturing jobs available toAfrican-Americans
E、
A、decrease in the level of educational credentials among new immigrants