Which of the Following Situations May Constitute Quid Pro Quo

Which of the following situations may constitute quid pro quo sexual harassment?

A) Many male employees of a company make repeated remarks about how men are more intelligent than women, which makes the environment difficult for female employees.
B) A male coworker makes unwelcomed sexual advances toward a female coworker, which causes her to feel that her job is threatened.
C) A female employee asks one of her subordinates out to dinner over and over again even though he always tells her no, and he is beginning to feel uncomfortable around her.
D) A male manager suggests to one of his female employees that she will receive a raise if she wears shorter skirts and works "overtime" once a week.
E) A male employee often disseminates e-mails of a sexual nature to his coworkers that creates an awkward atmosphere for a couple of his female coworkers.