Explanation:

- Acculturation (Option 1): Correct Answer. This is the process where different cultural groups come into direct contact, and they exchange cultural traits and complexes. Both groups may change or blend cultural elements as a result.

- Transculturation (Option 2): This means the merging or converging of cultures, but it's more about the process of adopting elements from each other, not just exchange.

- Enculturation (Option 3): This is about learning one’s own culture from birth, typically within the family or community.

- Contra culture (Option 4): This term refers to a subculture that opposes the dominant culture.