Final answer:
In Bronfenbrenner's Ecological Systems Theory, an example of the exosystem is mass media due to its indirect influence on an individual's development, differentiating it from more direct influences like family and friends in the microsystem.
Step-by-step explanation:
In Bronfenbrenner's Ecological Systems Theory, the exosystem refers to a layer of the environment that affects the individual through indirect means. An example of the exosystem could be the laws and customs of one's culture or mass media influences due to their indirect impact on the individual's development. However, considering the choices provided, mass media best fits the description of an exosystem influence because it represents a societal force that shapes the developmental context without direct interaction with the individual. Choices like family and friends would be considered part of the microsystem, while the neighborhood playground could be an example of the mesosystem or microsystem, depending on the context of the individual's direct interactions.