If trauma is suspected what should you do before beginning compression technique

For the answer to the question if trauma is suspected what should you do before beginning compression technique? The answer is simply stabilized the neck of the victim.
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Options to this question are:

A. Remove clothing
B. Position yourself on victim’s side
C. Stabilize the neck
D. Place heel of hand in between the nipples 

You should Stabilize the neck of the victim before beginning compression technique if trauma is suspected.

Explanation:

Keep the victim completely still till skilled facilitate arrives. Hold their head and neck to forestall them from moving until emergency care arrives. Conceive to calm the victim by reassuring them that assistance is on the manner, and encourage them in an exceedingly calming voice to remain utterly still.

Ithink it's choice d (antibiotic resistance)