Which of the Following Statements Is True About the Electrophysiologic

Which of the following statements is true about the electrophysiologic properties of the cardiac cells?

A) Myocardial muscles do not respond in an all-or-nothing manner.
B) When one cell is stimulated, the impulse does not spread throughout the heart muscle.
C) Myocardial cells do not possess the ability to initiate an electrical impulse.
D) Automaticity, excitability and conductivity are classified as mechanical properties, whereas contractility is classified as electrical.