First-Line Therapy for a School-Age Child with Group a Streptococcal

First-line therapy for a school-age child with group A streptococcal pharyngitis is:

A) Azithromycin 10 mg/kg on day one, then 5 mg/kg/day on days 2 to 5
B) Amoxicillin 80 mg/kg/day (maximum of 2 g/day) for 10 days
C) Clindamycin 20 mg/kg/dose b.i.d. for 10 days
D) Amoxicillin 50 mg/kg/day (maximum 1,000 mg/day) for 10 days