The nurse practitioner is re-evaluating a 4-year-old child who began amoxicillin for acute otitis media 3 days ago. The nurse practitioner should switch to another antimicrobial if.

the child complains of ear pain when the ear is examined.

the tympanic membrane remains red.

mobility of the tympanic membrane is detected during pneumatic otoscopy.

the child persists with temperature of 102°F.