Step 1: Understanding the question
The question concerns the challenges India faced immediately after gaining independence. These challenges included nation-building and establishing democratic, economic, and social frameworks.
Step 2: Analyzing the options
- (A) To forge a unified nation accommodating India's diversity: This was a significant post-independence challenge, requiring the integration of diverse populations into a single nation.
- (B) To reform the economy via a structural adjustment program: This was not an immediate post-independence concern. Structural adjustment programs were implemented much later, particularly during the economic liberalization of the 1980s and 1990s.
- (C) To cultivate democratic practices aligned with the Constitution: Establishing democracy in accordance with the newly adopted Constitution was a primary challenge post-independence.
- (D) To formulate policies for economic progress and poverty reduction: This was also a crucial challenge following independence, given widespread poverty and the imperative for economic development.
Step 3: Conclusion
The economic restructuring through a structural adjustment program was not an immediate post-independence challenge but became relevant later in India's economic trajectory. Therefore, option (B) is the correct answer.