If Brad Masturbates Alone, It Is Considered _______, but If

Multiple Choice

If Brad masturbates alone, it is considered _______, but if he and Devon manually stimulate each other, it is considered _______.

A) tribadism; an autoerotic behavior
B) outercourse; tribadism
C) an autoerotic behavior; mutual masturbation
D) mutual masturbation; tribadism
E) outercourse; an autoerotic behavior