**Core Concept**
Delayed dentition with multiple supernumerary teeth is a clinical manifestation of a genetic disorder characterized by abnormalities in tooth development. This condition is often associated with a specific genetic mutation affecting the development of dental tissues.

**Why the Correct Answer is Right**
The correct answer is **C. Cleidocranial dysplasia**. This rare genetic disorder is caused by mutations in the RUNX2 gene, which plays a crucial role in the development of dental tissues. Individuals with cleidocranial dysplasia often exhibit delayed dentition, multiple supernumerary teeth, and a characteristic "collodon baby" appearance. The condition is also associated with delayed closure of the cranial sutures, leading to macrocephaly.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is a distractor. Cleidocranial dysplasia is the correct answer, not a condition like "ectodermal dysplasia".
* **Option B:** This option is incorrect because it is a distractor. Although ectodermal dysplasia can affect dental development, it is not typically associated with multiple supernumerary teeth.
* **Option D:** This option is incorrect because it is a distractor. Cleidocranial dysplasia is a specific genetic disorder, not a broad category of conditions like "dental anomalies".

**Clinical Pearl / High-Yield Fact**
Cleidocranial dysplasia is often associated with a characteristic "collodon baby" appearance, which is a result of the delayed closure of the cranial sutures. This condition can be diagnosed prenatally or in early childhood, and it is essential to monitor dental development closely to prevent complications.

**Correct Answer: C. Cleidocranial dysplasia**