Concept:In public sector accounting, a warrant is the official document that authorizes the spending of public funds.
Explanation:The budget is first prepared and approved by the legislature, but it only states the planned income and expenditure.
It does not by itself allow any officer to spend money.
After the budget is approved, the minister of finance issues a warrant.
This warrant gives the accounting officer the legal authority to incur expenditure from the consolidated fund.
Therefore, spending in the public sector cannot begin without a warrant.
A vote refers to the amount approved for a particular department or purpose, but it is not the document of authority.
A voucher is merely evidence that a payment has been made or is proposed.
Hence, among the options given, the warrant is the correct authority to incur expenditure.
Answer:A. warrant