You are on-scene with a 48-year-old unresponsive male patient. Bystanders state he complained of chest pain and then suddenly collapsed. Vital signs are blood pressure 68/p, pulse 36, and respiratory rate 3. He is unresponsive to painful stimuli. After performing the primary assessment and treating all life threats, what is your next intervention?
A) Administer high-concentration oxygen at 15 lpm by bag-valve mask.
B) Apply the AED.
C) Package the patient for rapid transport.
D) Insert an oral airway.