**Core Concept**
The vitreous is a clear, gel-like substance that fills the space between the lens and the retina in the eye. It provides structural support and maintains the eye's shape, while also allowing light to pass through to the retina.

**Why the Correct Answer is Right**
The vitreous is composed of 98% water and 2% solids, including collagen fibers, hyaluronic acid, and other glycoproteins. These components give the vitreous its gel-like properties and maintain its shape within the eye. The vitreous is also rich in hyaluronic acid, which helps to absorb and distribute light within the eye.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because the vitreous is indeed mostly composed of water.
**Option B:** Incorrect because the vitreous is not a part of the lens capsule, but rather a separate structure that fills the space between the lens and the retina.
**Option C:** Incorrect because the vitreous is indeed a clear, gel-like substance that fills the space between the lens and the retina.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the vitreous is a critical component of the eye's structure and function. Damage to the vitreous, such as that caused by trauma or disease, can lead to vision loss and other complications.

**Correct Answer: C. The vitreous is a part of the lens capsule.