Sam believes that his new coworker, Drogo, is incompetent for the job. He has a preset notion that all the members of Drogo's ethnic group are lazy and unskilled workers. In spite of his views, Sam doesn't treat Drogo any differently from the rest of his coworkers because he is afraid of being fired. Which of the following terms best describes Sam's behavior?

A) sexism
B) zealotry
C) prejudice
D) discrimination