Which system includes interactions between different microsystems?

The mesosystem is the correct choice as it specifically refers to the interconnections and interactions between various microsystems in a person's life. Microsystems are the immediate environments in which individuals interact, such as home, school, and peer groups. The mesosystem encompasses the relationships and interactions between these different microsystems, illustrating how they influence and affect one another.

For example, it might involve how a student's family environment impacts their performance at school or how relationships between peers can affect their home life. This concept emphasizes that an individual's development is influenced by the interactions between different settings, rather than by each setting in isolation. Understanding this system is crucial for school counselors, as it helps them see the bigger picture of a student's environment and support their development more effectively.