**Core Concept**
Local anesthetics are a class of medications used to block the transmission of nerve impulses, preventing the sensation of pain. They act by interfering with the normal function of voltage-gated sodium channels in neuronal membranes.

**Why the Correct Answer is Right**
The primary mechanism of action of local anesthetics is through the inhibition of voltage-gated sodium channels. This inhibition prevents the rapid depolarization of the neuronal membrane, which is essential for the generation and conduction of action potentials. Local anesthetics bind to the sodium channels, blocking their activation and thereby preventing the influx of sodium ions into the cell. This results in a reduction in the frequency and amplitude of action potentials, ultimately leading to a loss of sensation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because local anesthetics do not primarily act through the inhibition of potassium channels. While potassium channels do play a role in the regulation of neuronal excitability, local anesthetics target sodium channels to achieve their effect.

**Option B:** This option is incorrect because local anesthetics do not primarily act through the inhibition of calcium channels. Calcium channels are involved in the regulation of neurotransmitter release, but local anesthetics target sodium channels to block action potential generation.

**Option C:** This option is incorrect because local anesthetics do not primarily act through the inhibition of GABA receptors. GABA receptors are involved in the regulation of inhibitory neurotransmission, but local anesthetics target sodium channels to block action potential generation.

**Clinical Pearl / High-Yield Fact**
Local anesthetics can be classified into two main groups: ester-linked and amide-linked compounds. Ester-linked local anesthetics, such as cocaine and procaine, are metabolized by plasma cholinesterase, while amide-linked local anesthetics, such as lidocaine and bupivacaine, are metabolized by the liver.

**Correct Answer: C. Inhibition of voltage-gated sodium channels.**