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.

a. we define ourselves in terms of our membership in certain groups and our differences with people who belong to other groups.

Explanation:

According to social identity theory, people tend to view their own identity by observing other people. After we do the observation, we will notify the group of people that have similarities with us (Such as similarities in status, hobbies, or principles)

After obtaining this information, we will identify ourselves with the group with the most similarities in order to obtain some sense of belonging in that group.

c. wright mills's sociological imagination suggest investigating to explain this increase?

this doesn't support enough information to answer the question.