Which one of the following is responsible for the preparation and presentation of Union Budget to the Parliament?

The correct answer is B because the Department of Economic Affairs, which functions under the Ministry of Finance, is the nodal agency responsible for the preparation and presentation of the Union Budget to the Parliament. Specifically, the Budget Division within this department compiles data from various ministries and departments to draft the annual financial statement and other related budget documents. While the other departments mentioned like Revenue, Expenditure, and Financial Services provide essential inputs and handle specific areas of finance, the primary responsibility for the overall budget process lies with the Department of Economic Affairs.