Which Represents the Correct Order in Which Action Potentials Spread

Multiple Choice

Which represents the correct order in which action potentials spread from the atria to the ventricles during a normal heartbeat in the mammalian heart?

A) Atrioventricular node  bundle of His  Purkinje fibers
B) Atrioventricular node  Purkinje fibers  bundle of His
C) Purkinje fibers  bundle of His  atrioventricular node
D) Sinoatrial node  Purkinje fibers  bundle of His
E) Sinoatrial node  ventricular muscle cells  Purkinje fibers