You arrive by ambulance at a construction site, where a man is lying on the street. the only information

The first action it's to determine the airway patency.

Explanation:

After falling it is possible that the man has fractured various parts of his body and still survived, but if he is unable to breathe because of blood in his airways he will perish.

Checking if the patient can breathe is one of the most important first actions in helping someone. If the airways are blocked somehow any further effort to save him would be useless. That way we can first check the airways, mobilize his neck and  provide oxygen then move him into the ambulance.

i say that the answer is 'd'

Answer lack of education;                   lack of protection                  lfailure of getting tested