**Core Concept**
Protective epithelium, also known as stratified epithelium, is a type of epithelial tissue that provides a barrier against external factors such as mechanical, chemical, and thermal stress. This layer is composed of multiple cell layers, allowing for a higher degree of resistance to abrasion and other forms of damage.

**Why the Correct Answer is Right**
The characteristic feature of protective epithelium is its stratified structure, where multiple layers of cells are stacked on top of each other. This arrangement allows for the cells in the top layer to be constantly shed and replaced by new cells from the underlying layers, thereby maintaining the integrity of the barrier. Additionally, the cells in the upper layers are typically flattened and have a larger surface area, which helps to absorb and dissipate mechanical forces.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specifically describe the characteristic feature of protective epithelium.
**Option B:** This option is incorrect because it describes a characteristic of simple epithelium, not protective epithelium.
**Option C:** This option is incorrect because it describes a characteristic of glandular epithelium, not protective epithelium.

**Clinical Pearl / High-Yield Fact**
One important clinical correlation is that protective epithelium is commonly found in areas of the body that are exposed to the external environment, such as the skin, esophagus, and anus. Damage to these areas can lead to a loss of the protective barrier, resulting in increased susceptibility to infection and other complications.

**Correct Answer: C. Stratified structure**