Answer:
A. The EOP functions as a huge line agency, while the executive departments do not.
Step-by-step explanation:
The MAIN difference between the Executive Office of the President and the executive departments is that the Executive office of President functions as a huge line agency, while the executive departments do not. In US form of government the line agency does work and exercises maximum authority whereas executive departments have support or advisory role.
The Executive Office of the President (EOP) consists of the immediate staff to the President, along with entities such as the Office of Management and Budget and the Office of the United States Trade Representative.