David Recently Discovered That His Long Time Friend, Mary, Is

David recently discovered that his long time friend, Mary, is homosexual. David stops visiting Mary and no longer allows Mary into his home. David denigrates Mary in front of their mutual friends and tells his other female friends that they too should avoid Mary because he believes Mary will try to recruit other women into the gay lifestyle. David is exhibiting

A) homophobia.
B) gender norms.
C) homoerotica.
D) compulsory homosexualism.