You are answering a USMLE-style medical question. Question: A 4-month-old infant is brought to the office by his parents due to sudden nose bleeding without trauma of any kind. He has a 1-month history of multiple bruising that measures 1 cm in diameter each in the hands and feet, and tiny red spots that appeared in the upper and lower extremities without any trauma either. He has no prior bleeding history nor any relevant family history. The vital signs include: heart rate 190/min, respiratory rate 40/min, blood pressure 99/42 mm Hg, and temperature 36.6 °C (97.9 °F). His physical exam shows pale skin color, petechiae in the soft palate and in the upper and lower extremities as well as ecchymosis in the back of the hands and feet. The complete blood count results are as follows: Hemoglobin 8.9 g/dL Hematocrit 41% Leukocyte count 10,500/mm3 Neutrophils 53% Bands 2% Eosinophils 1% Basophils 0% Lymphocytes 33% Monocytes 2% Platelet count 450,000/mm3 The coagulation test results are as follows: Partial thromboplastin time (activated) 30.0 sec Prothrombin time 13.6 sec International normalized ratio 0.99 Fibrinogen 364.9 mg/dL The blood smear shows hypochromia, poikilocytosis, and large platelets, while a platelet aggregation test with ristocetin is normal. The overall bleeding time is increased. What is the most likely cause of this patient’s condition? Options: A) Von Willebrand disease B) Glanzmann’s thrombasthenia C) Bernard-Soulier disease D) Scurvy Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.