You are answering a USMLE-style medical question. Question: A 3-day-old boy is admitted to the neonatal intensive care unit for seizures. He was born to a 33-year-old woman at 31 weeks gestation via cesarean section. His birth weight was 1400 grams. Vital signs are significant for systemic hypotension, bradycardia, and hypoventilation. On physical exam, the patient has an altered level of consciousness with decreased spontaneous and elicited movements. The patient is hypotonic on motor testing, has bulging anterior fontanelle, and appears cyanotic. Which of the following is the best next step in management? Options: A) Complete blood count B) Cranial ultrasonography C) Head CT D) MRI of the head Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.