The correct answer is A.  

Despite the fact that people with a heart attack benefit from prompt emergency care, many continue to deny their symptoms.  This is probably due to a complex interplay of psychological factors.  "Patient denial" occurs so frequently that it is one of the problems we must address for victims of heart attack.  

EMS personnel can provide the safest, most rapid transport to an appropriate medical facility, where eligible patients may receive "clot busters" (fibrinolytic therapy), which can increase the chance of survival, particularly if given within the first hour of symptoms.  Thus, it is critical to reduce the time interval from the call to 911 to transport and therapy.  

Answer b is incorrect because it is never prudent to wait during a heart attack.  Fatal arrhythmias associated with heart attack are most likely to occur in the first hour after the onset of symptoms.  

Answer c is incorrect because it suggests that having a family member trained in CPR makes it acceptable to wait until cardiac arrest develops.  EMS personnel can provide defibrillation if needed, can provide prearrival notification to the receiving hospital to speed advanced care when the victim arrives, and will know how to select the proper medical facility for the victim's clinical condition.  

Answer d is incorrect because research has shown that transport of the victim by EMS personnel is both faster and safer than if the victim drives to the hospital or is driven by a family member.