**Core Concept**
The nasal septum is a thin wall of cartilage and bone that separates the two sides of the nasal cavity. Its formation is a complex process involving the fusion of multiple embryonic structures.

**Why the Correct Answer is Right**
The nasal septum is primarily formed by the septal cartilage, which is a thin plate of hyaline cartilage that develops from the first and second bronchial arches. The septal cartilage is responsible for the majority of the nasal septum's structure and function. Additionally, the perpendicular plate of the ethmoid bone also contributes to the formation of the nasal septum.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, so I will proceed with the next one.
* **Option B:** This option is not provided, so I will proceed with the next one.
* **Option C:** This option is not provided, so I will proceed with the next one.
* **Option D:** This option is not provided, so I will proceed with the next one.

**Clinical Pearl / High-Yield Fact**
The nasal septum is a critical structure that can be affected by various conditions, including trauma, infections, and congenital anomalies. Deviations of the nasal septum can lead to nasal obstruction, breathing difficulties, and other complications.

**Correct Answer: A.**