Upon arriving at the scene of a vehicle collision, a firefighter finds an adult male patient who is unresponsive. During the primary assessment, which of the following actions should be performed FIRST?
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A
Assess the quality of the patient's breathing.
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B
Open the patient's airway using a head-tilt, chin-lift maneuver.
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C
Check for and control any life-threatening external bleeding.
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D
Check for a carotid pulse and begin chest compressions.