Which of the Following Is True of Diversity in American

Which of the following is true of diversity in American suburbs?

A) Diversity has decreased slightly over the last two decades.
B) Once diversity is achieved in a suburb, it tends to stay that way.
C) The oldest suburbs are the most likely to be diverse.
D) The proportion of metropolitan-area residents who live in mostly-white suburbs is increasing.
E) The number of diverse suburbs is at its lowest level in fifty years.