An 8-year-old female patient presents to the clinic with dysuria and increased urinary frequency. Her temperature is 102°F. She has no suprapubic or costovertebral angle tenderness. A urinalysis is positive for both leukocyte esterase and nitrites. What is the next step in management? A. Cystoscopy B. Start oral amoxicillin C. Start oral ciprofloxacin D. Start oral cefixime