The correct answer is option 4, the Third Five-Year Plan (FYP). Under the Third FYP, the Indian government introduced an agricultural strategy that led to the Green Revolution. The Green Revolution was a series of initiatives aimed at increasing agricultural productivity in India. It involved the introduction of high-yielding varieties of seeds, better irrigation techniques, and the use of chemical fertilizers and pesticides. The Third FYP, which was implemented from 1961 to 1966, prioritized agricultural development as a means to achieve self-sufficiency in food production. This plan was successful in significantly increasing crop yields and transforming India from a food-deficit country to a food-surplus nation. The Green Revolution had a profound impact on the Indian economy and helped to alleviate rural poverty and hunger.