**Core Concept**
Myoclonus is a neurological disorder characterized by brief, involuntary muscle jerks or twitches. Treatment of myoclonus often involves medications that modulate neurotransmitter activity in the brain, particularly those affecting the glutamatergic and GABAergic systems.

**Why the Correct Answer is Right**
Clonazepam is a benzodiazepine that enhances the activity of the inhibitory neurotransmitter GABA (gamma-aminobutyric acid), which helps to reduce muscle excitability and prevent myoclonic jerks. Clonazepam's anxiolytic and anticonvulsant properties also contribute to its efficacy in treating myoclonus. By facilitating GABAergic transmission, clonazepam reduces the excitability of neurons, thereby alleviating myoclonic symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** is not typically used for treating myoclonus.
**Option B:** is an antipsychotic medication primarily used for treating schizophrenia and bipolar disorder, not myoclonus.
**Option C:** is a medication used to treat seizures and Parkinson's disease, but it is not the first-line treatment for myoclonus.

**Clinical Pearl / High-Yield Fact**
Benzodiazepines like clonazepam are often used as a first-line treatment for myoclonus due to their rapid onset of action and efficacy in reducing muscle excitability.

**Correct Answer:** C. Clonazepam