Final answer:
Administering antibiotics would be the most appropriate action for a 3-year-old boy with acute otitis media.
Step-by-step explanation:
The most appropriate action would be to administer antibiotics to the 3-year-old boy with acute otitis media. Acute otitis media is caused by a bacterial infection in the middle ear, and antibiotics are the treatment of choice to eliminate the infection. Common antibiotics used to treat acute otitis media include amoxicillin and Augmentin.