You are answering a USMLE-style medical question. Question: A 14-year-old boy is brought to the emergency department by his mother after falling from the jungle gym and developing severe left knee pain and swelling. On presentation, he is found to be in pain with a hot, swollen, erythematous left knee. His past medical history is significant for abnormal coagulation lab tests before an appendectomy, but his mother cannot recall the exact details. Coagulation tests are conducted with the following results: Bleeding time: 3 minutes Prothrombin time: 11 seconds Partial thromboplastin time: 53 seconds Bradykinin formation: decreased Which of the following factors is most likely defective in this patient? Options: A) Factor VII B) Factor VIII C) Factor IX D) Factor XII Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.