Who Among the Following Is Most Likely a Bisexual

Who among the following is most likely a bisexual?

A) Matt, a man who is not sexually aroused by women but fantasizes about being sexually intimate with his male colleague, John
B) Dave, a commitment-phobic young man who has been sexually intimate with several women in his life
C) Jacob, a man who is confused about his sexual identity and feels that he might be a woman trapped in a man's body
D) James, a young man who is sexually intimate with his girlfriend Elaine as well as with his neighbor Mark, an older male