Final answer:
Cardioversion can be used to treat all rhythms EXCEPT ventricular fibrillation. Cardioversion restores the heart's normal rhythm using an electrical shock. It is commonly used to treat atrial fibrillation, atrial flutter, and supraventricular tachycardia.
Step-by-step explanation:
Cardioversion can be used to treat all of the following rhythms EXCEPT ventricular fibrillation (Option C). Cardioversion is a medical procedure that uses an electrical shock to restore the heart's normal rhythm. It is commonly used to treat atrial fibrillation, atrial flutter, and supraventricular tachycardia. Ventricular fibrillation, on the other hand, is a life-threatening emergency that requires immediate defibrillation rather than cardioversion.