By around what age does a child’s theory of mind allow them to understand that people think differently and have different preferences?

The correct answer is B. 4 years old.

By around age 4, children typically develop a more sophisticated understanding of others’ thoughts and feelings, also known as “theory of mind.” They start to recognize that different people can have different beliefs, desires, and preferences, which influences their behavior. This developmental milestone allows them to engage better in social interactions and understand perspectives different from their own.