**Core Concept**
The aqueous layer of the tear film is a complex mixture of water, mucins, lipids, and electrolytes that provides hydration, lubrication, and antimicrobial properties to the ocular surface. The aqueous layer is primarily secreted by the lacrimal gland and the goblet cells of the conjunctiva.

**Why the Correct Answer is Right**
The lacrimal gland produces the majority of the aqueous layer, secreting a watery fluid that is rich in electrolytes and enzymes. The goblet cells of the conjunctiva also contribute to the aqueous layer by secreting mucins, which help to stabilize the tear film and prevent evaporation. However, not all glands contribute to the aqueous layer.

**Why Each Wrong Option is Incorrect**
**Option A:** The lacrimal gland is the primary contributor to the aqueous layer, so this option is incorrect.
**Option B:** The goblet cells of the conjunctiva secrete mucins, which help to stabilize the aqueous layer, so this option is incorrect.
**Option C:** The Meibomian glands secrete lipids, which help to prevent evaporation of the aqueous layer, but they do not contribute to the aqueous layer itself.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the tear film is composed of three distinct layers: the aqueous layer, the mucous layer, and the lipid layer. Each layer has a specific function, and dysfunction of any one layer can lead to dry eye syndrome or other ocular surface disorders.

**Correct Answer:** C. Meibomian glands