Which of the Following Exemplifies the Sexual Double Standard

Which of the following exemplifies the sexual double standard?

A) Terry prefers to pay for her date's dinner, but will occasionally let her date pay.
B) Marna thinks that everyone should wait until marriage before having sex.
C) Gord dates four women at once, but will not date a woman with multiple boyfriends.
D) Nolan feels that it is unfair that women expect men to approach them for a date.