Which of the Following Statement Is Not True for Atrial

Which of the following statement is not true for atrial fibrillation versus atrial flutter?

A) Atrial flutter presents with a more organized and less chaotic abnormal heartbeat, compared with atrial fibrillation
B) In atrial flutter, the atrial rhythm is regular and the ventricular rhythm may be regular or irregular while in atrial fibrillation, the atrial rhythm is irregular so the ventricular rhythm is also irregular
C) Atrial flutter is not as life threatening as atrial fibrillation
D) Atrial fibrillation responds better to catheter ablation than atrial flutter