Dr.Willard is studying the way in which infant siblings interact with one another in the home.According to the ecological approach,Dr.Willard is studying the children in their

A) microsystem.
B) mesosystem.
C) exosystem.
D) macrosystem.

The ecological approach views a person's development as influenced by multiple layers of environmental factors, with the microsystem being the closest and most immediate layer of influence. The microsystem refers to the immediate environment in which the individual lives and interacts, such as the family, school, and peer group. Therefore, Dr. Willard studying infant siblings interacting with one another in the home is an example of studying them in their microsystem.