Step 1: Understand the concept of social environment.
The social environment refers to the cultural, social, and familial factors that influence individuals and organizations.
Step 2: Evaluate the options.
- Money supply, consumer protection laws, and the constitution are related to economic and legal environments, not social factors.
- The composition of family is a direct example of a social factor, as it influences societal norms and behaviors.
Step 3: Conclude.
The composition of family is an example of the social environment.
Final Answer:
\[
\boxed{\text{Composition of family}}
\]