A nurse is reinforcing teaching with a newly licensed nurse about reading a client's ECG tracing. The nurse should include in the teaching that the P wave represents which of the following cardiac electrical activities?

A. Ventricular depolarization: Ventricular depolarization corresponds to the QRS complex, not the P wave. B. Late ventricular repolarization: Ventricular repolarization is represented by the T wave (and early repolarization begins at the ST segment). C. Early ventricular repolarization: Ventricular repolarization is represented by the T wave (and early repolarization begins at the ST segment). D. Atrial depolarization: The P wave corresponds to atrial depolarization (electrical impulse spreading through the atria).