Explanation:

India's Five Year Plans were designed to guide the country's economic development. Each plan had specific priorities. \nOption A: The First Five Year Plan (1951-1956) primarily focused on 'Agriculture', aiming to address food shortages and improve the agricultural sector. \nOption B: The 'Services' sector, while growing, did not receive the primary thrust in the early Five Year Plans; its significant growth came later in India's economic development. \nOption C: The 'Second Five Year Plan' (1956-1961), known as the Mahalanobis Plan, laid strong emphasis on rapid 'Industrialization', particularly the development of heavy industries like steel plants, machinery manufacturing, and power projects. This was a deliberate shift from the agricultural focus of the first plan to build a strong industrial base. Therefore, this option is correct. \nOption D: While 'Transport' infrastructure development is crucial for economic growth and was part of all plans, it was not the *major thrust* or the primary focus of the Second Five Year Plan, which prioritized heavy industry.