While Waiting for a Bus,witnesses Hear a Man Growing Increasingly

While waiting for a bus,witnesses hear a man growing increasingly frantic as he cries,"My nitro tablets.Where are my nitro pills? I can't find my nitro tablets and I'm having a heart attack!" He collapses to the ground,clutching his chest.Everyone knows that it is a medical emergency.In this situation,who is most likely to help?

A) Gene, who has been sued before for leaving the scene of an accident
B) Tim, who has had a heart attack himself recently
C) Anita, who hears a voice from the back of the crowd, "Let me through! I'm a doctor!" and follows the lead of this model
D) James, who has completed a CPR course
E) Arthur, who notices that blood is streaming down the man's chin and onto his shirt