Final answer:
Doing a task for your peer when they are busy is the best example of the role peers play as an agent of socialization for school-aged children.
Step-by-step explanation:
The best example of the role peers play as an agent of socialization for school-aged children is doing a task for your peer when they are busy. This exemplifies peer support and cooperation, which are important aspects of socialization as children learn how to work together and help each other. It also helps build trust and positive relationships among peers.