Which of the Following Was an Explanation Offered for the Destructive

Which of the following was an explanation offered for the destructive race riots that swept American cities between 1964 and 1968?

A) they were revolutionary violence to overthrow a racist, reactionary society.
B) they were evidence of a communist plot to subvert the United States.
C) they were senseless outbursts by troublemakers.
D) they were the product of white racism, poverty, slum housing, poor education, and police brutality.
E) all of these choices