Paramedics bring in a 19-year-old male who was the restrained back-seat passenger in a vehicle that was rear-ended at approximately 35 miles per hour. He is on a backboard and is wearing a cervical collar. The patient states he struck his head on the front seat headrest, and though he did not lose consciousness, he does have a headache. He denies neck pain. His past medical history is significant for hemophilia B. His vital signs are stable and his physical examination is entirely normal except for a forehead contusion. What is the next MOST appropriate step in this man's care?
(A) Obtain cervical spine films.
(B) Obtain a CT scan of the head.
(C) Administer factor IX.
(D) Administer cryoprecipitate.