You have just arrived on the scene of a very serious motor vehicle collision. Emergency Medical Responders (EMRs) have rapidly extricated an unresponsive female from the driver's seat. The EMRs report that she was unrestrained and struck the steering wheel with her chest and abdomen. As you start the primary assessment, you note that the patient has snoring respirations and demonstrates shallow breathing at a rate of 24 breaths per minute. What should you do next?

A) Obtain vital signs
B) Secure the patient to backboard with a cervical collar placed
C) Perform a jaw-thrust maneuver
D) Start positive pressure ventilation

C) Perform a jaw-thrust maneuver