You Are on the Scene of a Multiple-Casualty Incident Where

You are on the scene of a multiple-casualty incident where a church van carrying 15 parishioners has overturned. You and your partner are in charge of the treatment unit and are presented with the following four patients. Who will you treat first?

A) A confused 69-year-old male with a respiratory rate of 40 and a rapid and weak radial pulse
B) An elderly female patient with a femur fracture and a yellow tag on her wrist
C) A 21-year-old male in cardiopulmonary arrest
D) A 13-year-old boy who walked to the treatment area complaining of a severe headache