**Core Concept**
The patient in question has a history of myocardial infarction (MI) and now presents with hypertension. The management of hypertension in a patient with a history of MI requires careful consideration of the potential benefits and risks of different antihypertensive agents. The goal is to select a medication that will effectively control blood pressure while minimizing the risk of adverse cardiovascular events.

**Why the Correct Answer is Right**
The patient's history of MI suggests that he may have underlying coronary artery disease, and therefore, it is essential to choose an antihypertensive agent that will not worsen cardiac function or increase the risk of further cardiovascular events. **Beta-blockers** are an excellent choice in this scenario, as they have been shown to reduce the risk of mortality and morbidity in patients with a history of MI. Beta-blockers work by blocking the effects of epinephrine on the heart, thereby reducing heart rate, contractility, and cardiac output. This can help to reduce the workload on the heart and decrease the risk of further cardiac damage.

**Why Each Wrong Option is Incorrect**
**Option A:** ACE inhibitors are also a good choice for patients with hypertension and a history of MI, but they may not be as effective as beta-blockers in reducing the risk of further cardiac events.
**Option B:** Diuretics are often used to treat hypertension, but they may not be the best choice for patients with a history of MI, as they can cause dehydration and electrolyte imbalances, which can worsen cardiac function.
**Option C:** Calcium channel blockers can be used to treat hypertension, but they may not be as effective as beta-blockers in reducing the risk of further cardiac events.
**Option D:** Alpha-blockers can be used to treat hypertension, but they may not be as effective as beta-blockers in reducing the risk of further cardiac events.

**Clinical Pearl / High-Yield Fact**
Beta-blockers are often referred to as "cardioselective" because they preferentially block beta-1 receptors in the heart, rather than beta-2 receptors in the lungs and other smooth muscle tissues. This helps to minimize the risk of adverse effects, such as bronchospasm and worsening of asthma.

**Correct Answer: C. Metoprolol**