**Core Concept**
The muscles of mastication are a group of muscles responsible for the movement of the mandible (lower jaw), which plays a crucial role in the process of mastication (chewing). These muscles are derived from the first pharyngeal arch, also known as the mandibular arch.

**Why the Correct Answer is Right**
The muscles of mastication, including the masseter, temporalis, medial pterygoid, and lateral pterygoid, are indeed derived from the first pharyngeal arch. This is because the first pharyngeal arch is responsible for the development of the mandible, the muscles of mastication, and the anterior portion of the external auditory meatus. The mesenchyme of the first pharyngeal arch gives rise to the muscles, bones, and ligaments that make up the masticatory apparatus.

**Why Each Wrong Option is Incorrect**
* **Option A:** The muscles of the face, including the buccinator and orbicularis oris, are derived from the second pharyngeal arch, not the first.
* **Option B:** The muscles of the neck, including the sternocleidomastoid, are derived from the occipital somites, not the first pharyngeal arch.
* **Option C:** The muscles of the tongue, including the intrinsic and extrinsic muscles, are derived from the third and fourth pharyngeal arches, not the first.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the muscles of mastication are innervated by the mandibular division of the trigeminal nerve (cranial nerve V3), which is responsible for the sensory and motor functions of the masticatory apparatus.

**Correct Answer: D. First pharyngeal arch.**