I have a question about the economics

If the federal government decreases its expenditures on goods and services by $10 billion and decreases taxes on personal incomes by $10 billion, which of the following will occur in the short run? A) The federal budget deficit will increase by $10 billion B) The federal budget deficit will decrease by $10 billion C) Aggregate income will remain the same D) Aggregate income will increase by up to $10 billion E) Aggregate income will decrease by up to $10 billion

I saw the answer is E why the answer is E?