**Core Concept**
Accommodation in the eye refers to the process of changing the shape of the lens to focus on objects at varying distances, allowing the eye to adjust to different visual tasks. This process is essential for maintaining clear vision and is a critical component of the eye's ability to focus on near or far objects.

**Why the Correct Answer is Right**
Accommodation is brought about by the contraction of the ciliary muscles, which causes the lens to become rounder and more curved. This increases the refractive power of the lens, allowing it to focus on objects that are closer to the eye. The contraction of the ciliary muscles also relaxes the tension on the zonular fibers, which are attached to the lens capsule and help to maintain its shape when the eye is focused on distant objects. The increased curvature of the lens allows it to converge light rays more effectively, enabling the eye to focus on near objects.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the physiological process of accommodation. While **Option A** may be related to the eye, it is not the correct answer.
**Option B:** This option is incorrect because it is not directly related to the process of accommodation. While **Option B** may be a factor in other eye movements or functions, it is not the correct answer.
**Option D:** This option is incorrect because it is not a muscle or structure involved in the process of accommodation.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the process of accommodation is closely linked to the concept of presbyopia, which is a age-related decline in the eye's ability to focus on near objects. This occurs due to the gradual loss of elasticity in the lens and the ciliary muscles, making it more difficult for the eye to change shape and focus on near objects.

**Correct Answer:** C. Contraction of the ciliary muscles.