What must a federal agency receive from the U.S. Department of the Treasury before it can begin spending an appropriation?

C A Treasury warrant is the formal notification from the U.S. Department of the Treasury that funds have been made available to a federal agency. Agencies cannot legally obligate or expend appropriated funds until a warrant has been issued. Apportionments and allotments come afterward in the budget execution process. Relevant Reference: Treasury Financial Manual (TFM), Volume I, Part 2 OMB Circular A-11 – Budget Execution GAO Red Book – Appropriations Law Answer : C. a warrant