The correct answer is A) part of the Executive Office of the President.
The National Security Council, the Office of Management and Budget, and the Council of Economic Advisers are all part of the Executive Office of the President.
The Executive Office controls agencies that support the work of the President of the United States. Two of the most important agencies are the Office of Management Budget and the National Security Council. The first one helps the President designing the budget, management, federal procurement, and information technology. The National Security Council is of extreme importance that helps and counsel the President on critical security issues that affect the country. Other agencies that depend on the Executive are the Council of Economic Advisers, the Office of National Drug Control Policy, Office of Administration, and the Office of Science and Technology Policy.