**Core Concept**
Vitamin E deficiency is a condition characterized by a lack of sufficient alpha-tocopherol in the body. It affects the nervous system, muscles, and skin, leading to various clinical manifestations. Vitamin E plays a crucial role in protecting cell membranes from oxidative damage.

**Why the Correct Answer is Right**
Vitamin E acts as an antioxidant by scavenging free radicals that damage cell membranes. It also facilitates the regeneration of vitamin C and alpha-lipoic acid, which are essential for maintaining the integrity of cell membranes. The deficiency of vitamin E can lead to impaired nerve function, muscle weakness, and skin problems due to the increased oxidative stress.

**Why Each Wrong Option is Incorrect**
**Option A:** Neurological symptoms such as peripheral neuropathy and ataxia are indeed manifestations of vitamin E deficiency.
**Option B:** Impaired night vision is a common symptom of vitamin E deficiency, which is often the first sign.
**Option C:** Muscle weakness is another clinical presentation of vitamin E deficiency, which can progress to more severe conditions like myopathy.

**Clinical Pearl / High-Yield Fact**
Vitamin E deficiency can be caused by genetic disorders like abetalipoproteinemia, intestinal malabsorption, or liver disease. It is essential to diagnose and treat the underlying cause to prevent further complications.

**Correct Answer: D.**