**Core Concept**
The question is testing the concept of accommodation in the nervous system, specifically the adaptation of sensory receptors to repeated stimuli. In this context, accommodation refers to the decrease in responsiveness of sensory receptors to a stimulus that is repeated at a subthreshold intensity.

**Why the Correct Answer is Right**
When a subthreshold, slowly rising stimulus is applied to a sensory receptor, the receptor initially responds weakly. However, as the stimulus continues, the receptor undergoes a process called accommodation, which involves a decrease in responsiveness to the stimulus. This decrease in responsiveness is due to the activation of potassium channels, which leads to hyperpolarization of the receptor membrane, making it less responsive to the stimulus. This adaptation mechanism helps to prevent the receptor from becoming overwhelmed by repetitive stimuli.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the phenomenon of accommodation in sensory receptors.
**Option B:** This option is incorrect because it suggests that the receptor becomes more responsive to the stimulus, which is the opposite of what occurs during accommodation.
**Option C:** This option is incorrect because it does not provide a clear description of the phenomenon being tested.

**Clinical Pearl / High-Yield Fact**
The concept of accommodation in sensory receptors is an important mechanism for preventing overstimulation and is relevant to our understanding of pain perception and sensory adaptation.

**Correct Answer: C. Accommodation**