You are answering a USMLE-style medical question. Question: A 34-year-old woman is brought to the emergency department following a high-speed motor vehicle collision in which she was the restrained driver. On arrival, she has a cervical collar in place and is unresponsive. Her temperature is 36.7°C (98°F), pulse is 70/min, and blood pressure is 131/76 mm Hg. Her pupils are dilated and not reactive to light. She is unresponsive to noxious stimuli. She is intubated, and mechanical ventilation is begun. Serum concentrations of electrolytes, urea nitrogen, and creatinine are within the reference range. Toxicology screening is negative. A CT scan of the head without contrast shows a massive intracranial bleed and a cervical spine injury at the level of C3. Which of the following is the most appropriate next step in diagnosing brain death? Options: A) Electroencephalography B) Magnetic resonance angiography C) Deep tendon reflex testing D) Corneal reflex test Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.