**Core Concept**
The zygomatic arch fracture is a common injury affecting the facial skeleton, particularly in the context of maxillofacial trauma. Accurate reduction and fixation of the zygomatic arch are crucial for restoring orbital and facial aesthetics, as well as ensuring proper function of the malar eminence.

**Why the Correct Answer is Right**
The most definitive check point for zygomatic arch reduction involves the use of a specific anatomical landmark, which allows for precise alignment and fixation of the fractured segment. This landmark serves as a reference point for ensuring that the zygomatic arch is properly reduced and aligned with the surrounding bony structures. The correct answer is related to the use of the **zygomatic-orbital buttress** as a key reference point for zygomatic arch reduction.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify a clear anatomical landmark for zygomatic arch reduction.
**Option B:** This option is incorrect as it is a general term and does not provide a specific reference point for reduction.
**Option C:** This option is incorrect as it is a different anatomical landmark used for a different purpose in maxillofacial surgery.

**Clinical Pearl / High-Yield Fact**
The zygomatic-orbital buttress serves as a crucial landmark for accurate reduction and fixation of the zygomatic arch, ensuring proper alignment with the surrounding bony structures and restoring facial aesthetics.

**Correct Answer:** C. The zygomatic-orbital buttress is the most definitive check point for zygomatic arch reduction.