Significant Advances Have Been Made Toward Racial Equality, Although Progress

Significant advances have been made toward racial equality, although progress has been uneven.Which of the following has NOT changed drastically since the 1960s?

A) the difference in high school graduation rates among blacks and whites
B) the number of blacks elected to political office
C) the difference in median income among black and white men
D) the percentage of Southern black schoolchildren attending schools with whites
E) legal prohibitions against racial discrimination