**Core Concept**
The management of alcohol withdrawal involves the use of medications that can reduce the severity of withdrawal symptoms and prevent life-threatening complications. Benzodiazepines are the primary treatment for alcohol withdrawal due to their ability to modulate the activity of GABA, a neurotransmitter that helps to regulate the activity of neurons in the brain.

**Why the Correct Answer is Right**
The correct answer is Chlordiazepoxide (Librium), a long-acting benzodiazepine that is commonly used to prevent and treat alcohol withdrawal symptoms. Chlordiazepoxide works by enhancing the activity of GABA at the GABA_A receptor, which leads to a decrease in the excitability of neurons and a reduction in the severity of withdrawal symptoms. This is particularly important in the management of delirium tremens, a severe form of alcohol withdrawal that can be life-threatening.

**Why Each Wrong Option is Incorrect**
**Option A:** Diazepam (Valium) is another benzodiazepine that can be used to treat alcohol withdrawal, but it is not the first choice due to its shorter duration of action compared to chlordiazepoxide.

**Option B:** Clonidine is an alpha-2 adrenergic agonist that can be used to manage some symptoms of alcohol withdrawal, such as hypertension and tachycardia, but it is not sufficient to prevent the development of delirium tremens.

**Option D:** Propranolol is a beta-blocker that can be used to manage some symptoms of alcohol withdrawal, such as hypertension and tachycardia, but it is not sufficient to prevent the development of delirium tremens.

**Clinical Pearl / High-Yield Fact**
It is essential to note that benzodiazepines should be used judiciously in the management of alcohol withdrawal, as they can be habit-forming and may lead to dependence in some individuals. A careful assessment of the patient's history of substance use and a gradual tapering of the medication are essential to prevent complications.

**Correct Answer:** C. Chlordiazepoxide (Librium)