A 60-year-old male with a history of angina pectoris is prescribed a medication that decreases heart rate, contractility, and myocardial oxygen demand by blocking beta-adrenergic receptors. Which of the following is the primary mechanism of action of this drug class in treating his angina?
✓ Correct Answer: Option B
Beta-blockers reduce heart rate, contractility, and blood pressure, thereby decreasing myocardial oxygen demand and cardiac workload. This mechanism is crucial for relieving angina symptoms caused by an imbalance between oxygen supply and demand.