**Core Concept**
The dermatomes are a series of mapped areas on the skin that are supplied by nerve fibers originating from specific spinal nerve roots. Each dermatome corresponds to a specific spinal nerve root, which can be used to assess the integrity of the spinal cord and nerves.

**Why the Correct Answer is Right**
The little finger of the hand is supplied by the ulnar nerve, which arises from the C8 and T1 nerve roots. The dermatome corresponding to the C8 nerve root, known as the C8 dermatome, covers the area of the hand including the little finger. This dermatome is responsible for transmitting sensory information from this area to the central nervous system.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because the C5 dermatome corresponds to the lateral aspect of the arm, from the deltoid region to the axilla, and does not cover the hand.

**Option B:**
This option is incorrect because the C6 dermatome corresponds to the lateral forearm and the thumb, but not the little finger.

**Option C:**
This option is incorrect because the T2 dermatome corresponds to the medial aspect of the upper arm, and does not cover the hand.

**Clinical Pearl / High-Yield Fact**
It's essential to remember the dermatomes of the upper limb to assess patients with neurological symptoms, such as numbness or weakness, and to determine the level of spinal cord injury.

**Correct Answer:** C.