A child has learned to distinguish between the statements that "John believes it is raining outside" and "it is raining outside." A Developmental Psychologist would consider this evidence that the child .

theory of mind        

Explanation:

Theory of mind: In psychology, the term "theory of mind" is described as a theory in which an individual's capability to attribute different mental statuses including knowledge, beliefs, emotions, intents, desires, etc to others and oneself is being determined. According to developmental psychologists, the theory of mind is considered as necessary or significant in a way to understand that the other person possesses intentions, beliefs, perspective, desires, that are being different from one's own.

In the question above, the given statement represents the theory of mind.

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