Which of the Following Is the Primary Reason for the Change

Which of the following is the primary reason for the change in the public attitude toward gays in recent decades?

A) the fact that a very large number of gay people could no longer tolerate being "in the closet"
B) the influence of the American Psychological Association
C) the increasing number of gay people in Canadian society
D) the influence of the gay rights movement
E) the medicalization of homosexuality