Which One of the Following Is TRUE

Which one of the following is TRUE?

A) Economic growth always makes the distribution of income more equal.
B) During the past 15 years, the distribution of income within the U.S. has become more equal.
C) During the past 15 years, both those at the bottom and at the top of the income distribution have experienced higher average incomes.
D) There is not enough data collected to know how the income distribution is changing.