According to social cognitive theory,

A) parents are the only source of reinforcement of children's behavior.
B) parents and peers in combination influence socialization.
C) children only learn socialization after they begin school.
D) socialization is a complex system involving parents, peers, and other agents.

Social Cognitive Theory

Albert Bandura’s expansion of social learning theory; holds that children learn gender roles through socialization.

Reinforcement

In behavioral psychology, a process by which a stimulus increases the probability of a preceding behavior by either a positive or negative reinforcement.

Parents

Individuals who have a biological or legal relationship to a child, responsible for the child's care, upbringing, and development.