What Causes Fusion Beats

Multiple Choice

What causes fusion beats?

A) Depolarization of the ventricle by a sinus impulse that coincides with polarization by a premature ventricular impulse
B) Polarization of the ventricle by a sinus impulse that coincides with depolarization by a premature ventricular impulse
C) Simultaneous depolarization of the ventricle by a sinus impulse and a premature ventricular impulse
D) Simultaneous polarization of the ventricle by a sinus impulse and a premature ventricular impulse