​From which of the following years did the fourth five-year plan commence?​

Correct option is A

• Fourth Five-Year Plan: Two successive years of drought, devaluation of the currency, a general rise in prices and erosion of resources disrupted the planning process and after three Annual Plans between 1966 and 1969, the fourth Five-year plan was started in 1969.
• It began in 1969 and ended in 1974.
• The Gadgil Formula served as the foundation for the Fourth Five-Year Plan (1969–1974), which placed a strong focus on growth with stability and the move toward self-reliance.
• It focused on the development of agriculture, industry, and infrastructure. It was implemented during Indira Gandhi's tenure as prime minister in an effort to address earlier shortcomings.
• The Green Revolution increased agriculture, and the government nationalized fourteen significant Indian banks. Additionally, the Drought Prone Area Program was introduced. 
• The actual growth rate was 3.3% compared to the target growth rate of 5.6%.