A 62-year-old male was the restrained driver of a car that was hit on the driver's side. Emergency Medical Responders have extricated and fully immobilized him with a cervical collar and long board. When asked, he complains of dizziness as well as leg and arm pain. Assessment reveals multiple contusions and deformity to his left forearm and a laceration with minor bleeding to the left side of his face. His airway is open and his breathing is labored. A rapid radial pulse is felt. Skin is cool and dry. What assessment finding would the EMT address first?

A) Bleeding from facial laceration
B) Rapid pulse
C) Complaint of dizziness
D) Labored breathing