You are answering a USMLE-style medical question. Question: A 9-year-old boy is brought in by his mother because of bruising on his torso and limbs. The patient’s mother denies any other symptoms and says he is otherwise healthy. Physical examination shows multiple petechiae and bruising on the torso and extremities bilaterally. The remainder of the physical exam is unremarkable. A complete blood count is normal. His coagulation profile reveals: Prothrombin time (PT) 12 sec Activated partial thromboplastin time (aPTT) 60 sec Which of the following is the most likely diagnosis in this patient? Options: A) Acute lymphoblastic leukemia B) Immune thrombocytopenic purpura C) Von Willebrand disease D) Hemophilia A Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.