Explanation:

- C.H. Cooley: He developed the concept of the primary group. These are small, close-knit, and emotionally significant groups, like family and close friends.

- Correct Answer: Option 2 - C.H. Cooley

- Edward Shils: He was a sociologist known for his work on tradition, mass society, and intellectuals, but not specifically for 'primordial primary' groups.

- Erich Fromm: A social psychologist and humanistic philosopher known for his work on freedom and societal impacts on psychology.

- George Homans: A sociologist who focused on social behavior from a psychological perspective, especially through social exchange theory.