**Core Concept**
The Universal Immunization Programme (UIP) focuses on preventing various infectious diseases, including those causing blindness in children. Vitamin A supplementation is a key component of the UIP, particularly in preventing Vitamin A deficiency (VAD) and its complications.

**Why the Correct Answer is Right**
Vitamin A plays a crucial role in maintaining the integrity of the cornea and the epithelial surfaces of the eye. In Vitamin A deficiency, the cornea becomes thin and cloudy, leading to corneal ulcers and potentially, blindness. Supplementing children with Vitamin A regularly helps prevent VAD and its associated complications, such as night blindness, xerophthalmia, and corneal ulcers.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the UIP's strategy for preventing blindness.
**Option B:** While Vitamin D is essential for bone health, it is not directly related to preventing blindness in the context of the UIP.
**Option C:** This option is not a known method for preventing blindness in the UIP.

**Clinical Pearl / High-Yield Fact**
The World Health Organization recommends administering high-dose Vitamin A supplements to children at 9 months and 18-24 months of age to prevent Vitamin A deficiency and its complications.

**Correct Answer:** C. Vitamin A supplementation.