Which agency serves to assist the President in budgeting and management?

The Office of Management and Budget (OMB) is the correct answer because it plays a critical role in managing the federal budget and overseeing the implementation of the President's policies. The OMB assists the President in preparing the federal budget, reviewing agency budgets, and ensuring efficient management of government resources. It evaluates the effectiveness of programs, sets priorities, and works to align financial resources with the administration's goals.

The White House Staff, while influential, primarily focuses on advising the President and managing day-to-day operations within the White House rather than specifically handling budgeting and management. The Department of Treasury manages the nation’s finances, including revenue collection and economic policy, but does not specifically assist the President with budgeting in the same comprehensive manner as the OMB. The Environmental Protection Agency, on the other hand, is primarily focused on environmental protection, regulatory issues, and enforcing laws related to air and water quality, and does not have a direct role in budgeting or management for the President. Thus, the OMB is uniquely positioned to fulfill the budgeting and management assistance needed by the President.