**Core Concept:** National Population Policy (NPP) is a strategy formulated by a country to control or regulate its population growth. The long-term objective of NPP is to achieve population stability.

**Why the Correct Answer is Right:** The correct answer is not explicitly provided in the options given, but we can deduce the correct year based on the objectives of the National Population Policy 2000.

**Why Each Wrong Option is Incorrect:**

A. **Incorrect because the NPP does not specify a year for achieving population stability.**
B. **Incorrect because the NPP does not mention a specific year for population stability.**
C. **Incorrect because the NPP does not mention a year for population stability.**
D. **Incorrect because the NPP does not mention a year for population stability.**

**Clinical Pearl / High-Yield Fact:** Achieving population stability is a long-term goal of NPP, but the specific year mentioned in the question is not specified in the options. It is crucial for students to understand the objectives of NPP and the importance of population control strategies in public health.

**Correct Answer:** The correct answer is not explicitly mentioned in the options. However, the long-term objective of NPP is to achieve population stability, which is essential for public health and sustainable development. Students should be aware of population control strategies and their importance in public health.