What is the purpose of treating angina with antianginal agents?

The purpose of treating angina with antianginal agents primarily involves the prevention of heart attacks and the reduction of angina attacks. Angina is characterized by chest pain resulting from reduced blood flow to the heart muscle, often due to coronary artery disease. Antianginal medications, such as nitrates, beta-blockers, and calcium channel blockers, work by improving blood flow to the heart, reducing the heart's workload, and decreasing oxygen demand. This alleviates the pain associated with angina and helps prevent future episodes, which can be a precursor to more serious cardiovascular events like heart attacks.

The other options focus on conditions not directly related to angina treatment. For instance, reducing hypertension may be a secondary benefit of some antianginal agents, but it is not their primary purpose. Similarly, managing diabetes complications and eliminating headaches are unrelated to the treatment of angina. The focus of antianginal therapy is distinctly on improving cardiac function and angina control, thus highlighting the importance of option B as the correct answer.