The Studies Done by Anderson and His Colleague Between 2000

The studies done by Anderson and his colleague between 2000 and 2010 indicated that

A) masculinity became more rigidly defined in mot men's sports.
B) gay male athletes were more likely to come out but less likely remain in sports.
C) sport cultures enforced a "don't ask,don't tell" policy about sexual identity.
D) homophobia declined in many sport cultures.