The correct answer is: A. 1966-71
The Fourth Five Year Plan (1966-71) was the fourth five-year plan of the Government of India. It was launched in 1966, after the end of the Third Five Year Plan. The main objective of the Fourth Five Year Plan was to achieve self-reliance in agriculture and industry. The plan also aimed to increase the production of food grains, steel, and other essential commodities.
The Fourth Five Year Plan was a success in many ways. The production of food grains increased significantly, and the country became self-sufficient in food. The production of steel also increased, and the country became a major producer of steel. However, the plan was not without its problems. The country faced a severe drought in 1966-67, which led to a decline in agricultural production. The plan also faced problems with inflation and unemployment.
Despite its problems, the Fourth Five Year Plan was a significant achievement for the Government of India. It helped to lay the foundation for the country’s economic growth in the years to come.
The other options are incorrect because they do not correspond to the actual time duration of the Fourth Five Year Plan.