Explanation:

- Option 1: President

- The President of India is the ceremonial head of state.

- The President does not typically head government bodies or commissions.

- Option 2: Prime Minister

- The Prime Minister of India traditionally served as the Chairman of the Planning Commission.

- The Planning Commission, however, was replaced by the NITI Aayog in 2015.

- Option 3: Minister of Planning

- There was no specific Minister of Planning who chaired the Planning Commission.

- The Minister of Planning often worked alongside the Commission for policy planning.

- Option 4: Finance Minister

- The Finance Minister handles the country's economic policies and budget.

- This role does not include chairing the Planning Commission.

ANSWER: Option 2 - Prime Minister