A 28-year-old male patient was cutting limbs from a tree when he lost his footing and fell approximately 20 feet. He is unresponsive and has shallow breathing, with a rate of 28 breaths/min. His radial pulse is weak and thready, and his skin is cool to the touch. Emergency Medical Responders (EMRs) have placed him on a nonrebreather face mask and are holding manual spine motion restriction. His respirations are sonorous. Based on these assessment findings, which of these instructions would you next provide to the EMRs?

A) "The patient has snoring respirations, so let's go ahead and open the airway with the head-tilt, chin-lift maneuver."
B) "Do not cover the patient with a blanket, because that will cause his blood vessels to dilate and drop his BP."
C) "Let's elevate the patient's legs 8 to 12 inches so more blood gets to his vital organs."
D) "Let's take off the oxygen mask and try manually opening the airway."

D) "Let's take off the oxygen mask and try manually opening the airway."