भारतातील कोणती पंचवार्षिक योजना आर्थिक वाढीच्या हॅरोड-डोमार मॉडेलवर आधारित होती?

The correct answer is Option A (First Five-Year Plan).

Key Points:
• First Five-Year Plan (1951–1956): India's First Five-Year Plan was explicitly formulated on the Harrod-Domar Economic Growth Model, which links economic growth rate directly to the national savings rate and the capital-output ratio (with economist K. N. Raj drafting its introductory framework).
• Core Sectoral Priority: To overcome post-Partition foodgrain shortages, refugee rehabilitation challenges, and inflationary pressures, the plan accorded top priority to Agriculture, Price Stability, Power, and Irrigation (initiating landmark multi-purpose river projects like Bhakra-Nangal, Hirakud, and Damodar Valley).
• Target vs Achievement: Against a modest target growth rate of 2.1% per annum, the economy achieved an impressive 3.6% annual GDP growth, making the First Plan a benchmark success.
• Distractor Analysis: The Second Plan (1956–61) was based on the P. C. Mahalanobis Model (rapid heavy industrialization), the Third Plan (1961–66) utilized the Sukhamoy Chakravarty and John Sandy input-output model, and the Fourth Plan (1969–74) followed the Gadgil Formula and Ashok Rudra–Alan Manne model.
• Key Takeaway: The First Five-Year Plan (1951–56) was based on the Harrod-Domar model with primary emphasis on agricultural and irrigation development.