Social identity theory says that: select one: a. we define ourselves in terms of our membership in certain groups and our differences with people who belong to other groups. b. we tend to believe our own actions are caused by motivation or ability rather than the situation. c. our expectations about another person cause that person to act in a way that is consistent with those expectations. d. we quickly form an opinion of people based on the first information we receive about them. e. our emotions screen out large blocks of information that threaten our beliefs and values.