In atrial fibrillation

A. False  Small rapid waves indicate the atrial fibrillation.

B. True  Atrial rate is higher than ventricular rate as some impulses are filtered out by the atrioventricular node.

C. False  Sinus arrhythmia indicates normal sinus rhythm.

D. True  Due to the irregularity of the impulses passing through the AV node.

E. False  QRS complexes are normal since the pattern of ventricular depolarization is normal.