You are answering a USMLE-style medical question. Question: A 16-year-old male presents to his pediatrician with complaints of malaise, fatigue, sore throat, and fever over the last several days. His vital signs are as follows: T 39.1 C, HR 82, BP 122/76, RR 14, and SpO2 99%. Physical examination is significant for splenomegaly, tonsillar exudate, and posterior auricular lymphadenopathy. The tonsils are not notably enlarged. Laboratory work-up shows an elevated lymphocyte count, atypical lymphocytes on a peripheral blood smear, and a positive heterophile antibody screen. Which of the following is the best management of this patient's condition? Options: A) Bed rest and activity limitation B) Ganciclovir C) Amoxicillin D) Prednisone Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.