阅读下列短文，从每题所给的四个选项（a,b,c和d）中，选出最佳选项。
prejudice is a preconceived opinion that is not based on fact or reason. examples of prejudice in schools include believing that some students are particular type of people simply because of the way they dress or act, or believing that a certain group is good at sports simply because many peop1e in that group are goad at sp
