You are the first to arrive at the scene of a road traffic collision. A passenger is unconscious but appears to be breathing normally. What is the first step you should take according to the DR ABC first aid procedure?
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A
Check for any dangers to yourself, the casualty, and others.
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B
Open the casualty's airway by tilting their head back.
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C
Attempt to get a response by shaking their shoulders.
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D
Check for circulation and begin chest compressions.