Looking at the Income Distribution in the United States Since

Looking at the income distribution in the United States since 1970,we see that

A) only the lowest 20 percent and highest 20 percent increased their shares of income.
B) the lower 50 percent increased its share of income and the upper 50 percent stayed the same.
C) the highest 20 percent increased its share of income.
D) all the 20 percent groups increased their shares of income.
E) the lower 50 percent increased its share of income and the upper 50 percent decreased its share of income.