In the United States,the Lifetime Distribution of Income Is More

In the United States,the lifetime distribution of income is more equal than the annual distribution.This statement is:

A) true because the rich have gotten richer and the poor have gotten poorer.
B) true because there is considerable income mobility over time.
C) false because people tend to stay in the same income quintile over extended periods of time.
D) false because the rich have gotten richer and the poor have gotten poorer.