Final answer:
The best action for the pediatrician to take would be to explain the consequences of the boy not receiving care and also call the father to ask about the difficulty in making appointments.
Step-by-step explanation:
The best action for the pediatrician to take in this situation would be option d) A and B. This means that at the man's next visit, the pediatrician should explain the consequences of the boy not receiving care to motivate the father to bring him in, and also call the father to ask why he's having trouble making the appointments.