The correct answer is C.  

This man has no known heart disease, so you should phone 911 (or the emergency response system) immediately.  If he had a history of heart disease and a prescription for nitroglycerin, you could suggest that he take up to 3 nitroglycerin tablets at intervals of 3 to 5 minutes and see if the tablets relieve the pain.  

Answer a is incorrect because symptoms of a heart attack are often dismissed as heartburn.  You should not delay phoning 911 or other emergency response number.  The risk of arrhythmias and death is highest in patients with myocardial infarction (heart attack) during the first hour after the onset of symptoms - this is the time when the victim is most in need of EMS support.  

Answer b is incorrect because a call to the victim's personal physician will waste time and delay transport of the victim to an Emergency Department.  EMS personnel will be prepared to treat sudden arrhythmias that may develop during transport, and they can provide pre-arrival notification to the receiving hospital to speed emergency care at the hospital.  

Answer d is incorrect because EMS personnel can provide the fastest and safest transport to an Emergency Department.  EMS personnel are trained and equipped to treat arrhythmias and cardiac arrest, they can provide pre-arrival notification to the receiving hospital to speed assessment and treatment of the patient on arrival, and they will be prepared to triage the victim to the appropriate hospital on the basis of his clinical condition.