Treating AOM in toddler

Esteban is an 18-month-old child who presents with his father for a sick visit. The child, who is typically healthy and UTD with immunizations and has no drug allergies, has had URI-like symptoms for the past 6 days with congested cough and clear to yellow nasal discharge. Per parental report, Esteban is drinking fluids without difficulty and has a slightly reduced appetite and had a single episode of post tussive vomiting 3 days ago. For the past 36 hours, his father reports increased crankiness and intermittent fever to 102.6 °F (39.2 °C), with father stating, “This is how he acted a few months ago when he had an ear infection.” Physical exam confirms the diagnosis of bilateral AOM. When prescribing an antimicrobial for this child, which of the following represents the first-line treatment option?
A. Oral azithromycin
B. Oral cefpodoxime
C. IM ceftriaxone
D. Oral amoxicillin