Detailed Explanation:

❌ Option 1 – Incorrect: The Fourth Five-Year Plan (1969–74) focused on growth with stability and strengthening agriculture (Green Revolution), not the service sector.

❌ Option 2 – Incorrect: The Fifth Five-Year Plan (1974–79) emphasized poverty alleviation (Garibi Hatao) and self-reliance, not solely industry.

❌ Option 3 – Incorrect: The Third Five-Year Plan (1961–66) prioritized self-reliance and heavy industry; globalisation came only after 1991 economic reforms.

✅ Option 4 – Correct: The First Five-Year Plan (1951–56) concentrated on agriculture and irrigation to address food shortages, with projects like Bhakra Nangal Dam.