The correct answer is C. 15.
A primary group is a small group in which members interact with each other on a face-to-face basis and have a high degree of intimacy, emotional attachment, and mutual identification. Primary groups are important because they provide us with a sense of belonging, support, and identity. They also play a role in our socialization and help us to learn how to interact with others.
The 15 primary groups are:
- Family
- Friends
- Neighbors
- Coworkers
- Classmates
- Religious group members
- Sports team members
- Hobby group members
- Volunteer group members
- Political party members
- Social club members
- Fraternity or sorority members
- Sorority or fraternity members
Option A is incorrect because there are only 15 primary groups, not 19.
Option B is incorrect because there are only 15 primary groups, not 28.
Option D is incorrect because there are only 15 primary groups, not 20.