**Core Concept**
The processing of tactile stimulation involves the integration of sensory information from the skin, which is crucial for our perception of touch, pressure, and vibration. This process is mediated by the primary somatosensory cortex, a region of the brain that is responsible for processing basic sensory information from the body.

**Why the Correct Answer is Right**
Tactile stimulation is initially processed in the thalamus, specifically in the ventral posterior nucleus, before being relayed to the primary somatosensory cortex (Brodmann's area 3, 1, and 2). In the primary somatosensory cortex, the sensory information is further processed and mapped onto the body surface, allowing us to localize and identify different tactile stimuli. This complex process involves the activation of various neurons and their projections to higher-order sensory areas.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the primary motor cortex (Brodmann's area 4) is involved in the planning and execution of voluntary movements, not the processing of tactile stimulation.
**Option B:** This option is incorrect because the primary visual cortex (Brodmann's area 17) is responsible for processing visual information from the retina, not tactile information from the skin.
**Option C:** This option is incorrect because the primary auditory cortex (Brodmann's area 41) is involved in the processing of auditory information, not tactile stimulation.

**Clinical Pearl / High-Yield Fact**
Damage to the primary somatosensory cortex can result in a range of sensory deficits, including numbness, tingling, and loss of proprioception (the sense of body position and movement). This can occur due to various conditions, such as stroke, traumatic brain injury, or neurodegenerative diseases like Alzheimer's disease.

**Correct Answer: C. Primary somatosensory cortex**