A 3-year-old boy presents with acute right ear pain, fever (39.2°C), and irritability for 18 hours following a viral URI 5 days ago. Otoscopy shows a bulging, erythematous right tympanic membrane with obliterated landmarks and decreased mobility. The left TM is mildly erythematous but mobile. Tympanometry reveals a flat TYPE B trace on the right with a mild conductive hearing loss of 25 dB (bone conduction normal), as shown by the structure marked **B** in the diagram. Based on these findings consistent with acute otitis media, which of the following is the most appropriate first-line empiric antibiotic therapy for this child?
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