Which office is responsible for loading funds into the accounting system for spending purposes?

The correct answer is the Financial Management Office (FMO). This office is typically responsible for overseeing financial transactions and ensuring that funds are appropriately allocated and managed within the accounting system. The FMO plays a critical role in loading funds for various spending purposes, thereby enabling the tracking and management of expenditures in a controlled and systematic manner.

The functions of the FMO might include budgeting, disbursing funds, ensuring compliance with financial regulations, and monitoring financial performance. All these activities are essential for effective financial management and oversight within an organization. This aligns with the responsibilities that typically fall under an office designated for financial management.

While the other offices mentioned may play significant roles within financial operations, they have distinct functions that do not include the direct responsibility for loading funds into the accounting system for spending purposes. Hence, the FMO is the appropriate choice for this task.