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

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

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