You are answering a USMLE-style medical question. Question: A 37-year-old woman presents to the emergency department with confusion, anxiety, sweating, and episodes of vomiting. She is accompanied by her sister who says that her symptoms developed acutely and is unsure about what caused it. She is currently on methimazole, which she last took approximately 1 week ago. Approximately 5 days ago she developed an upper respiratory infection managed with bed rest and ibuprofen. Her temperature is 105°F (40.6°C), blood pressure is 95/68 mmHg, pulse is 145/min, and respirations are 23/min. On physical examination, the patient has altered mentation and is agitated and diaphoretic. The patient also has a goiter, exophthalmos, warm skin, and a hand tremor. She is started on intravenous fluids. Which of the following is the best treatment option for this patient? Options: A) Antibiotics B) Carotid massage C) Clonazepam D) Propranolol Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.