Explanation:

Let’s break it down:

- Option 1: A budget is absolutely a description of the income and expenditure of the government. It lays out how much money is coming in (taxes, other revenues) and how it’ll be spent.

- Option 2: It’s also a document of economic policy. The budget spells out the government's broader priorities and strategies for the economy, from welfare to infrastructure, and taxation to subsidies.

- Option 3: This one’s off base. A budget describes programs and expenditures—saying it’s a description of non-programs doesn’t make sense. It’s about what the government does spend on, not what it doesn’t.

- Option 4: All of these. This just means you think Options 1, 2, and 3 are all correct, but since Option 3 isn’t accurate, this option isn’t right either.

The correct answer is Option 1: A budget is a description of income-expenditure of government.