Step 1: Understanding the Question:
The question asks in which life stage an individual is most likely to change their behavior or opinions to match those of their peer group.
Step 2: Detailed Explanation:
• Peer conformity is the social pressure to "fit in" and follow the norms of friends and age-mates.
• While it begins in middle childhood, it peaks during early to mid-adolescence (B).
• Adolescents are striving for identity and independence from their parents, which makes them increasingly reliant on their peers for social validation and support.
• This pressure can be positive (pro-social behavior) or negative (risk-taking, substance use).
• By early adulthood, individuals usually develop a more stable self-identity and better impulse control, leading to a decrease in the absolute need for peer conformity.
Step 3: Final Answer:
Peer conformity is of greatest significance during adolescence.