**Core Concept:**

The question is asking about a beta blocker with dual properties of blocking both alpha and beta receptors. Beta blockers are a class of medications primarily used for cardiovascular conditions, including hypertension, angina, and heart failure. They work by blocking beta-adrenergic receptors, which are involved in the body's response to stress, such as exercise or emotional stress. Blocking these receptors helps to reduce heart rate, contractility, and blood pressure, thereby improving cardiovascular function.

**Why the Correct Answer is Right:**

The correct answer, **A. Propranolol**, is a beta blocker with both alpha and beta blocking properties. Propranolol is a non-selective beta blocker, meaning it can block both beta-1 and beta-2 receptors. Additionally, it also has alpha blocking properties, particularly alpha-1 receptors, which contributes to its use in hypertension and angina management.

**Why Each Wrong Option is Incorrect:**

A. **Option B (Acebutolol)** is a selective beta1 blocker, meaning it primarily blocks beta-1 receptors rather than beta-2 receptors. This limits its use in certain situations and may lead to unwanted side effects.

C. **Option C (Labetalol)** is a selective beta-blocker with both beta-1 and beta-2 blocking properties, but it also has alpha-1 blocking properties.

D. **Option D (Atenolol)** is a selective beta-blocker, primarily blocking beta-1 receptors, with minimal alpha-1 blocking properties.

**Clinical Pearl:**

Understanding the pharmacological properties of beta blockers is essential in selecting the appropriate medication for specific clinical scenarios. Non-selective beta-blockers, like propranolol, are often preferred in conditions where alpha-1 blocking properties are beneficial, such as hypertension and angina. On the other hand, selective beta-blockers are preferred in conditions where beta-1 selective action is desired, such as heart failure management.