## Core Concept
The question pertains to the control of eye movements, specifically horizontal movements, and the identification of the final center responsible for this function. Eye movements are controlled by a complex network of brainstem and cerebellar structures. Horizontal eye movements are primarily controlled by the **paramedian pontine reticular formation (PPRF)** and the **abducens nucleus**, with integration and coordination occurring at various levels.

## Why the Correct Answer is Right
The **abducens nucleus** serves as the final common pathway for horizontal eye movements. It is responsible for the integration of signals for conjugate horizontal gaze. The abducens nucleus controls the **lateral rectus muscle** directly and sends internuclear neurons to the **medial longitudinal fasciculus (MLF)**, which then project to the **oculomotor nucleus**, controlling the **medial rectus muscle**. This coordinated action allows for conjugate horizontal eye movements.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is not specified, but if it refers to another structure not directly involved in the final control of horizontal eye movements, it would be incorrect because it does not accurately represent the final center for these movements.
- **Option B:** Similarly, without specifics, if this option does not directly relate to the abducens nucleus or its equivalent role, it would be incorrect.
- **Option D:** This option would be incorrect if it suggests a structure that is not the final center for controlling horizontal eye movements.

## Clinical Pearl / High-Yield Fact
A key clinical correlation is **Internuclear Ophthalmoplegia (INO)**, which results from a lesion in the **medial longitudinal fasciculus (MLF)**. This condition disrupts the conjugate horizontal eye movements, leading to impaired adduction of the eye on the same side as the lesion, with nystagmus of the abducting eye. Recognizing INO and its association with MLF lesions is crucial for diagnosing and managing patients with disorders of eye movement.

## Correct Answer: C. Abducens nucleus.