Question

a medical practitioner specializing in children and their diseases. surgeon internals pediatrician psychologist

Explanation:

A pediatrician is a medical doctor who specializes in the health - care of children, diagnosing and treating their diseases. A surgeon focuses on performing operations, "internals" is not a recognized medical specialty term here, and a psychologist deals with mental health and behavior, not general medical care of children.

Answer:

C. pediatrician