The study of human behavior is called psychology. There are different emotions like happiness, sadness, anger and etc in human behavior.
The correct answer to the question is option C which is the social environment.
According to the question, the social environment is the main reason for bringing and learning the culture. A newborn baby learns first from the surroundings than the teachers and parents.
Hence, the correct answer is option C.
For more information about the question, refer to the link:-
https://brainly.com/question/5763151