Final answer:
The developmental task indicated when a 12-year-old child shows interest in playing soccer, participating in Boy Scouts, and collecting stamps is identity development.
Step-by-step explanation:
The developmental task indicated when a 12-year-old child shows interest in playing soccer, participating in Boy Scouts, and collecting stamps is identity development. During middle childhood, children begin to explore different activities and interests as they try to understand their own likes and dislikes, strengths and weaknesses. Through these activities, they are able to develop a sense of identity and begin to understand who they are as individuals.