The most accurate description of the executive office of the president is option B. It is a group of advisers who help the president.
The Executive Office of the President of the United States (EOP) constists of a group of agencies at the center of the executive branch of the United States federal government. The EOP supports the work of the President. It includes many offices and agencies, such as the White House Office (the staff working directly for and reporting to the President, such as West Wing staff as well as the President’s closest advisers), National Security Council or Office of Management and Budget.