As You Arrive at the Scene of a House Fire,a

As you arrive at the scene of a house fire,a very upset man screams at you to help his young son,who is trapped under a piece of burning wood on the ground.Which of the following should you do first?

A) With the father's help, grab the boy by the arms and pull him from underneath the wood.
B) Size-up the scene before acting.
C) Perform an initial assessment on the patient.
D) Use a blanket to put out the fire on the piece of wood.