A young man was riding a motorcycle when he was hit head on by a car and thrown from the bike. Your scene size-up reveals him to be lying supine in the roadway with obvious deformity to his right thigh and left ankle, with blood noted on his pants in these areas. The patient assessment reveals he is unresponsive with snoring respirations and is breathing irregularly at 16 times per minute. His radial pulse is moderate in strength, and his skin is warm and dry. Which action should be performed first by the EMT?

A) Open the airway using the head-tilt, chin-lift maneuver
B) Expose and splint both legs to prevent further injury
C) Check for distal pulses in both lower extremities
D) Provide manual cervical spine motion restriction

D) Provide manual cervical spine motion restriction