What Has Happened to the Distribution of Wealth in the United

What has happened to the distribution of wealth in the United States since 1980?

A) All segments of the economy have seen their incomes increase quickly.
B) All segments of the economy have seen their incomes decrease quickly.
C) Middle class earners have seen their incomes decrease, while the incomes of the wealthy and lower classes have increased rapidly.
D) The middle and lower classes have seen their incomes remain flat or decrease, while the incomes of the wealthy have increased rapidly.
E) The middle and upper classes have seen their incomes remain flat, while the incomes of lower class earners have increased rapidly.