**Core Concept**
The upper lid retractors are a group of muscles responsible for elevating and retracting the upper eyelid, playing a crucial role in the movement and function of the eye. These muscles are essential for maintaining proper eye alignment and preventing ptosis.

**Why the Correct Answer is Right**
The upper lid retractors consist of the levator palpebrae superioris and the Müller's muscle. The levator palpebrae superioris is a smooth muscle that originates from the lesser wing of the sphenoid bone and inserts into the upper border of the tarsus, while Müller's muscle is a smooth muscle that arises from the superior tarsal plate and inserts into the upper border of the tarsus. Both muscles work together to elevate and retract the upper eyelid, with the levator palpebrae superioris being the primary muscle responsible for this movement.

**Why Each Wrong Option is Incorrect**
* **Option A:** The orbicularis oculi muscle is responsible for closing the eyelid, not retracting it.
* **Option B:** The inferior oblique muscle is responsible for rotating the eye and elevating the eye when it is adducted, not retracting the upper eyelid.
* **Option C:** The superior rectus muscle is responsible for elevating the eye, not retracting the upper eyelid.

**Clinical Pearl / High-Yield Fact**
The levator palpebrae superioris muscle is the primary muscle responsible for upper eyelid retraction, and its dysfunction can lead to ptosis, a condition characterized by drooping of the upper eyelid.

**Correct Answer: C. Müller's muscle is a component of the upper lid retractors.**