Answer:
d. family
Explanation:
Most developmental research on social competence comes from family studies. The family is the ground for the development of a child's social competence even before the child goes to school and this is the reason developmental researches on social competence focuses on family studies.
Parents must help their children in developing social competence by engaging the children in various learning activities, implement their ideas and interact with the children, the parents can also offer activities and resources to the child. This will help the child develop social competence and easily interact with people when the go outside the home to places like the school and playground.