**Core Concept**
The nasopharynx is a region of the pharynx located behind the nasal cavity and above the level of the soft palate. It is lined by a specific type of epithelium that is adapted to the unique environment of this area.

**Why the Correct Answer is Right**
The nasopharynx is lined by pseudostratified ciliated columnar epithelium. This type of epithelium is well-suited to the nasopharynx because it contains cilia that help to move mucus and debris out of the nasal cavity and towards the pharynx for swallowing or expiration. The pseudostratified columnar epithelium also contains goblet cells that produce mucus, which helps to trap dust and other particles before they can enter the lungs.

**Why Each Wrong Option is Incorrect**
* **Option A:** Stratified squamous epithelium is found in areas that are subject to high friction and abrasion, such as the skin and the oral cavity. It is not found in the nasopharynx.
* **Option B:** Simple cuboidal epithelium is found in areas that are involved in secretion and absorption, such as the kidneys and pancreas. It is not found in the nasopharynx.
* **Option D:** Simple columnar epithelium is found in areas that are involved in absorption, such as the small intestine. It is not found in the nasopharynx.

**Clinical Pearl / High-Yield Fact**
The nasopharynx is an important area for the diagnosis and treatment of conditions such as nasopharyngeal carcinoma, which is a type of cancer that is more common in certain parts of the world.

**Correct Answer: C. Pseudostratified ciliated columnar epithelium**