You are answering a USMLE-style medical question. Question: A 23-year-old man comes to the physician because of a 1-week history of anorexia, nausea, upper abdominal pain, and dark-colored urine. He recently returned from a trip to Belize. His temperature is 38.3°C (100.9°F). Physical examination shows scleral icterus and tender hepatomegaly. Serum studies show markedly elevated transaminases and anti-hepatitis A virus antibodies. In this patient, infected cells express more MHC class I molecules on their surfaces. This cellular event is primarily induced by a molecule that is also responsible for which of the following changes? Options: A) Upregulated expression of exogenously synthesized antigens B) Enhanced macrophage phagocytic function C) Activation of eukaryotic initiation factor 2 D) Increased breakdown of intracellular RNA Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.