Explanation:

- The Pradhan Mantri Vaya Vandana Yojana is a pension scheme introduced by the Government of India for senior citizens.

- The objective is to ensure a steady income for individuals aged 60 and above.

- It offers an assured return on investments made for 10 years.

- Option 1: Unit Trust of India

- This organization deals primarily with mutual funds and investments.

- It doesn't operate this particular pension scheme.

- Option 2: Post Office

- Offers various savings schemes but is not responsible for this pension scheme.

- ?? Option 3: LIC of India

- LIC (Life Insurance Corporation of India) is the official operator of this scheme.

- They manage the scheme's financial and administrative aspects.

- Option 4: State Bank of India

- While it provides various banking services, it is not involved in this particular scheme.