The theory that holds that we each have a sense of ourselves as a unique individual but that we also define ourselves based on our group memberships is called

Social identity theory.

Explanation:

Social Identity Theory (SIT): It was developed by Tajfel & Turner in 1979.

It is defined as an individual's perception of oneself of who they are in any group membership. Eventually, people tend to be in a group where they find their pride and self-esteem as being part of the group. These groups can be any of them like family, peers, and social class, etc.

There are three components of social identity theory:

1. Social categorization.

2. Social identification.

3. Social comparison.

Example:

1. Ethnic and religious identities.

2. Political identities.

3. Personal relationships.

i'd have to with d.

explanation:

the old way of life was represented by superstition, an angry god, and absolute submission to authority. the thinkers of the age of reason ushered in a new way of thinking. this new way championed the accomplishments of humankind. individuals did not have to accept despair. science and reason could bring happiness and progress. kings did not rule by divine right. they had an obligation to their subjects. europeans pondered the implications for nearly a century. americans put them into practice first.