Which of the Following BEST Qualifies as an Example of Prejudice

Which of the following BEST qualifies as an example of prejudice?

A) Sarah believes that gay men tend to like fashion. Thus, when Sarah meets Tom, a gay friend of her brother's, she asks him who his favorite fashion designer is (instead of asking him, say, about sports or movies) .
B) The CEO of an advertising agency decides that she would like to employ more women. Thus, even though the agency receives applications from equally qualified men and women, far more women than men are hired.
C) Vera believes that old people smell bad. When getting on the bus earlier this week, she therefore felt repulsed when she saw that the only available seat was next to an old person.
D) Horace has never met a black person before, but he watches a lot of old movies. He has learned from these movies to associate black people with aggression as well as athleticism.