**Core Concept**
The epidermis is the outermost layer of the skin, consisting of multiple layers of epithelial cells. Each layer has distinct characteristics, and understanding their roles is crucial for dermatological and general medical practice.

**Why the Correct Answer is Right**
The "prickle layer" is a colloquial name for the stratum spinosum, which is the thickest layer of the epidermis. This layer is characterized by the presence of desmosomes, which are intercellular junctions that provide mechanical strength to the skin. The stratum spinosum is composed of polyhedral cells with short spines or projections, which give it a characteristic appearance under a microscope. These cells are rich in keratin, a protein that provides structural support to the skin.

**Why Each Wrong Option is Incorrect**
* **Option A (Stratum Basale):** This is the deepest layer of the epidermis, consisting of a single layer of columnar or cuboidal cells. It is the site of cell division and proliferation, but it is not known as the "prickle layer".
* **Option B (Stratum Corneum):** This is the outermost layer of the epidermis, consisting of dead, flat cells that provide a barrier against water loss and external pathogens. It is not known as the "prickle layer" due to its flat morphology.
* **Option D (Stratum Lucidum):** This is a thin, clear layer of dead cells found in the palms and soles. It is not a distinct layer in other areas of the body and is not known as the "prickle layer".

**Clinical Pearl / High-Yield Fact**
The stratum spinosum is an important layer of the epidermis because it provides mechanical strength to the skin. Damage to this layer can lead to conditions such as epidermolysis bullosa, a group of genetic disorders characterized by skin blistering.

**Correct Answer:** C. Stratum Spinosum.