A School-Age Child Has Had Nasal Discharge and Daytime Cough

A school-age child has had nasal discharge and daytime cough but no fever for 12 days without improvement in symptoms. The child has not had antibiotics recently and there is no significant antibiotic resistance in the local community. What is the appropriate treatment for this child?

A) Amoxicillin 45 mg/kg/day
B) Amoxicillin 80-90 mg/kg/day
C) Amoxicillin-clavulanate 80-90 mg/kg/day
D) Saline irrigation for symptomatic relief