निम्नलिखित में से किसे बच्चे के समाजीकरण का प्राथमिक कारक (agent) माना जाता है?

is a primary agent of socialization, while ______ is a secondary agent of socialization.

A primary school teacher observes that a new student, initially shy, starts interacting more in class after consistently playing with a small group of friendly peers during recess. Which socialization agent is most prominently influencing this change?