**Core Concept**
The question is testing the management of akathisia, a type of extrapyramidal side effect caused by the use of antipsychotic medications such as haloperidol. Akathisia is a disorder characterized by subjective feelings of restlessness and an urge to move, often accompanied by objective signs of agitation and fidgeting.

**Why the Correct Answer is Right**
The drug of choice for treating akathisia is a beta-blocker, specifically propranolol. This is because beta-blockers, particularly non-selective ones like propranolol, have been shown to be effective in reducing the symptoms of akathisia. The exact mechanism of action is not fully understood, but it is thought to involve the blockade of beta-adrenergic receptors in the brain, which may contribute to the development of akathisia. Propranolol is often considered the first-line treatment due to its efficacy and relatively benign side effect profile.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely a distractor and does not have a clear connection to the treatment of akathisia.
**Option B:** This option may be a dopamine agonist, which would be counterintuitive in treating akathisia, as the disorder is thought to be related to an overactive dopaminergic system.
**Option C:** This option may be a benzodiazepine, which can be used to treat agitation and anxiety but is not the preferred treatment for akathisia.

**Clinical Pearl / High-Yield Fact**
When treating akathisia, it's essential to consider the underlying cause and adjust the treatment plan accordingly. In cases where the akathisia is caused by a specific medication, switching to a different antipsychotic or reducing the dose of the offending medication may be necessary.

**Correct Answer:** B. Propranolol