You are answering a USMLE-style medical question. Question: A 43-year-old man comes to the emergency department with nausea, abdominal discomfort, diarrhea, and progressive perioral numbness for the past 24 hours. 3 days ago, he underwent a total thyroidectomy for treatment of papillary thyroid cancer. His only medication is a multivitamin supplement. He appears fatigued. While measuring the patient's blood pressure, the nurse observes a spasm in the patient's hand. Physical examination shows a well-healing surgical wound on the neck. Which of the following ECG findings are most likely in this patient? Options: A) Torsade de pointes B) QT prolongation C) Peaked T waves D) PR prolongation Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.