A 65-year-old man with a history of paroxysmal atrial fibrillation presents with palpitations.. Flecainide

A 65-year-old man with a history of paroxysmal atrial fibrillation presents with palpitations. He has no other history of note and a recent echocardiogram was normal. An ECG confirms fast atrial fibrillation. Which one of the following agents is most likely to cardiovert him into sinus rhythm?
A. Sotalol
B. Procainamide
C. Flecainide***
D. Disopyramide
E. Digoxin.