**Core Concept**
Optic nerve damage can be caused by various conditions such as glaucoma, optic neuritis, or trauma. Assessing the integrity and function of the optic nerve is crucial for diagnosing and managing these conditions. Visual evoked potentials (VEPs) are a method to evaluate the conduction of electrical signals through the optic nerve.

**Why the Correct Answer is Right**
The correct answer is **B. Visual Evoked Potentials (VEPs)**. VEPs measure the electrical signals generated by the retina in response to visual stimuli. This test is particularly useful for detecting damage to the optic nerve, as it can assess the integrity of the nerve and the transmission of visual information from the eye to the brain. VEPs are a valuable diagnostic tool for conditions such as optic neuritis, glaucoma, and optic atrophy.

**Why Each Wrong Option is Incorrect**
**Option A:** Magnetic Resonance Imaging (MRI) is not the best investigation for optic nerve damage, although it can be used to identify structural abnormalities and lesions affecting the optic nerve.
**Option C:** Optokinetic nystagmus is a test used to evaluate the vestibular-ocular reflex, which is not directly related to assessing optic nerve damage.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that VEPs can help differentiate between optic nerve damage and other visual pathway disorders, such as lesions affecting the visual cortex.

**Correct Answer:** B. Visual Evoked Potentials (VEPs)