Explanation:

- Agents of socialization are the individuals, groups, and institutions that influence personal attitudes, beliefs, and behaviors.

- Option 1: Includes innate drives. This is incorrect as innate drives are biological, not social influences.

- Option 2: Includes the family and schooling. Correct, as these are primary agents of socialization, especially in early life.

- Option 3: Change in importance over time. Correct, as different agents (like peers and media) gain influence as people age.

- Option 4: Both b and c. This is correct because it acknowledges both valid statements about agents of socialization.