Which of the Following, According to an Open-Systems Theorist, Would

Which of the following, according to an open-systems theorist, would be a catalyst in the change of conservative religious groups from heterosexism to a more liberal ideology?

A) The change in policy of one or two fairly conservative denominations to lessen the resistance to homosexuality.
B) Liberal attitudes about homosexuality may infiltrate into the church as new people from the secular society join conservative congregations.
C) Conservative churches would change toward more openness if liberal churches advocated even more liberal policies than they now do
D) Both a and b