If a Nation's Lorenz Curve Lies on the 45-Degree Line

If a nation's Lorenz curve lies on the 45-degree line of income equality:

A) proportionately more of the nation's income is received by the lowest 20 percent of families than by the highest 20 percent.
B) income is unequally distributed.
C) proportionately more of the nation's income is received by the highest 20 percent of families than by the lowest 20 percent.
D) the income received by each 20 percent of families is 20 percent of the total income.