According to the Textbook,what Is the Definition of a Stereotype

According to the textbook,what is the definition of a stereotype?

A) the belief that a certain trait,behavior,or attitude characterizes all members of a group
B) rigidly held,unfavorable attitudes about members of a different group
C) the belief that humans are subdivided into distinct groups that can be ranked as superior or inferior
D) unfair treatment of people based on some social characteristic,such as race,ethnicity,or sex