Final answer:
The Chief Financial Officer (CFO) is responsible for overseeing the state's money spent legally by a state agency.
Step-by-step explanation:
The officer responsible for overseeing the state's money spent legally by a state agency is the Chief Financial Officer (CFO). The CFO is responsible for managing the state's finances, including budgeting and accounting. They ensure that the state agency's expenditures are within the legal requirements and follow proper financial procedures.