When Presenting Information on Cardiac Arrest and Automated External Defibrillation

When presenting information on cardiac arrest and automated external defibrillation to a community group, a man asks why people should perform CPR prior to the arrival of EMS if they are going to provide a shock. Your response would be:

A) "Immediate CPR can prolong the period in which the heart can be shocked following cardiac arrest."
B) "In many cases, CPR can reverse the cardiac arrest, making a shock by the AED unnecessary."
C) "In the American Heart Association's Chain of Survival, CPR is the most important link in surviving cardiac arrest."
D) "CPR is needed to keep blood flowing through the body so the EMTs can give the patient IV medications when they arrive."