Explanation:

- Option 3: 1951

- Correct Answer: The First Five Year Plan in India was launched in 1951. It focused on the agricultural sector and aimed to improve the country's food production to ensure food security and reduce dependency on food imports.

- Option 1: 1952

- Incorrect: This is not the year the First Five Year Plan was released. However, it is within the period of the First Five Year Plan, which spanned from 1951 to 1956.

- Option 2: 1961

- Incorrect: By 1961, India was implementing its Third Five Year Plan, which focused on making India self-reliant and developing the agricultural and industrial sectors.

- Option 4: 1960

- Incorrect: This year falls within the Third Five Year Plan period (1961-1966), not the First Five Year Plan.

In summary, the First Five Year Plan was introduced in 1951.