**Core Concept**
The change in the shape of the palate from flat to vault-shaped occurs due to the growth and remodeling of the maxilla and the development of the nasal cavity. This process is influenced by the forces of growth and development, including the effects of the tongue, the nasal septum, and the palatal shelves.

**Why the Correct Answer is Right**
The correct answer is related to the growth of the nasal cavity and the development of the palatal shelves. During fetal development, the palatal shelves grow upwards and inwards, eventually fusing in the midline to form the primary palate. The secondary palate, which includes the hard and soft palates, develops later and is influenced by the growth of the nasal cavity. The increase in nasal cavity size and the subsequent growth of the palatal shelves lead to the formation of a vault-shaped palate in adults.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a particular factor that contributes to the change in palate shape.
* **Option B:** This option is incorrect because the growth of the tongue is not a primary factor in the change in palate shape.
* **Option C:** This option is incorrect because the development of the nasal septum is not a primary factor in the change in palate shape.

**Clinical Pearl / High-Yield Fact**
The growth and development of the palate are influenced by a complex interplay of genetic and environmental factors, including the effects of the tongue, the nasal septum, and the palatal shelves.

**Correct Answer:** C.