**Core Concept**
The underlying principle being tested is the role of vitamin A in preventing nutritional blindness in children, highlighting the importance of **vitamin A supplementation** in public health programs. Vitamin A is crucial for maintaining the integrity of the **cornea** and **retina**. Deficiency can lead to night blindness and more severe conditions.

**Why the Correct Answer is Right**
Although the specific correct answer is not provided, typically, the vitamin A supplement administered contains **retinol** or its equivalents, such as **retinyl palmitate** or **retinyl acetate**, which are forms of pre-formed vitamin A. These are effective in preventing and treating vitamin A deficiency due to their direct utilization by the body.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details, we can infer that any option not containing a direct form of vitamin A or its most effective precursors would be incorrect.
**Option B:** Similarly, this would be incorrect if it does not align with known, effective forms of vitamin A supplementation.
**Option C:** This option would be wrong if it represents an ineffective or less commonly used form of vitamin A for supplementation purposes.
**Option D:** Incorrect if it does not match the established standard for vitamin A supplementation in prevention programs.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that vitamin A supplementation is a cost-effective strategy to prevent vitamin A deficiency, which can lead to **night blindness** and, if severe, **keratomalacia** and blindness. Regular supplementation programs, especially in areas where dietary deficiency is common, can significantly reduce the incidence of these conditions.

**Correct Answer:**