**Core Concept**
Supernumerary teeth are additional teeth that occur in addition to the normal complement of teeth. They can be classified into different morphological types based on their shape and size. These types can be important in understanding the clinical implications and management of supernumerary teeth.

**Why the Correct Answer is Right**
The morphological types of supernumerary teeth include:
* **Supplemental teeth**: These are small teeth that resemble the normal teeth in the dental arch and can be found in almost any location.
* **Odontomas**: These are hamartomatous growths of dental tissue that can resemble a normal tooth but are actually a collection of dental tissue.
* **Dens evaginatus**: This is a supernumerary tooth that has a small projection on its surface, resembling a cusp.
* **Gemination**: This is a type of supernumerary tooth where the tooth bud fails to separate during development, resulting in a single tooth with two cusps.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not a recognized morphological type of supernumerary tooth.
* **Option B:** This option is not a recognized morphological type of supernumerary tooth.
* **Option D:** This option is not a recognized morphological type of supernumerary tooth.

**Clinical Pearl / High-Yield Fact**
Supernumerary teeth can be associated with various dental and systemic anomalies, including cleft lip and palate, and syndromes such as Gardner's syndrome.

**Correct Answer:** C. Dens evaginatus.