The correct answer is A: to control the executive branch.
President Georg Washington established the Cabinet as his group of advisers who reported in private and solely to the U.S. chief executive officer ( meaning him ). It was his way to control the executive branch of his government.
At the beginning, only three executive departments were established: the Department of State, the Department of Tresury and the Department of War. Washington also appointed the Attorney General Edmund Randolph in his first cabinet.