Correct Answer: C

Rationale: Digoxin is a cardiac glycoside that increases the force of myocardial contraction (positive inotropic effect) and reduces heart rate by enhancing vagal tone and slowing conduction through the atrioventricular (AV) node. The observation of a reduced yet stable heart rate (72 bpm) indicates therapeutic rate control, especially useful in conditions such as atrial fibrillation and heart failure. The drug does not decrease cardiac output; rather, it improves efficiency by allowing the ventricles more time to fill during diastole. It also does not increase myocardial oxygen demand.
Therefore, the combination of improved contractility and controlled rate represents the desired clinical response to Digoxin therapy.

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