Taxes, fundraising events, and government subsidies and grants are common _____ that fund a fire and emergency services organization's budget.

The correct answer highlights that taxes, fundraising events, and government subsidies and grants are essential means by which fire and emergency services organizations generate the necessary funds to operate. Revenue sources refer to the various channels through which income is obtained, which is crucial for maintaining budgets and providing services.

In the context of fire and emergency services, these funds are vital in supporting operational costs, purchasing equipment, training personnel, and responding to emergency situations. Recognizing these as revenue sources emphasizes the importance of diverse funding mechanisms that ensure the financial stability and effectiveness of emergency services.

The other options do not accurately describe these funding mechanisms: proposed expenditures represent budget items that an organization plans to spend on, capital budgets refer to long-term investment planning rather than income generation, and service costs denote the expenses incurred while providing services rather than the income itself. Understanding the distinction between revenue sources and these other financial terms is key for anyone involved in managing or supporting the budget of a fire and emergency services organization.