Question

a device that delivers electric shock to the heart to restore its normal rhythm is called a(n)
heart starter
shocker
cpr
aed

Explanation:

The question asks for a device that delivers electric shocks to restore normal heart rhythm. "Heart starter" is non-technical; "Shocker" is informal; CPR is manual chest compressions/rescue breaths, not an electric device. AED (Automated External Defibrillator) is the correct technical term for such a device.

Answer:

D. AED