Which of the Following Is an Example of Social Exchange

Which of the following is an example of social exchange, a micro reason for extramarital sex?

A) Oscar, who has a strained relationship with his wife because he is unemployed, engaged in extramarital sex.
B) Danielle, who has low self-esteem, cheated on her husband because it helped boost her ego.
C) Mario, who has high social and economic status in society, has extramarital sex with attractive women who enjoy being with wealthy men.
D) Monica had sex with someone she had first met through a social networking site because she believed no one would find out about it.