Answer:
d. Ventricular repolarization
Explanation:
In the given electrocardiogram, the arrow is pointing towards T wave. T wave of electrocardiogram represents ventricular repolarization. T wave represents diastole of ventricle and relaxation of the myocardium of ventricles.
T wave occurs with the beginning of relaxation of ventricles. A wider but smaller proportion of T wave on ECG represents the fact that repolarization is a slow event as compared to depolarization.
