A victim has suffered a second-degree burn to a small area of the lower arm. What is the proper treatment for this injury?（）

A.Immerse the arm in cold water for 1 to 2 hours，apply burn ointment，and bandage
B.Open any blisters with a sterile needle，apply burn ointment and bandage
C.Apply burn ointment，remove any foreign material and insure that nothing is in contact with the burn
D.Immerse the arm in cold water for 1 to 2 hours，open any blister and apply burn ointment