Which Statement Best Characterizes the Relationship Between Presidents and the Bureaucracy

Which statement best characterizes the relationship between presidents and the bureaucracy?

A) Presidents can have a large influence on the politics of bureaucratic restructuring, but only as long as it occurs during a period of unified government.
B) Presidents can only reorganize the federal bureaucracy at the senior level and have little influence on the overall political orientation of the bureaucracy.
C) Presidents are not required to accept the existing bureaucracy as a given and thus can actively participate in the politics of bureaucratic restructuring.
D) Presidents have no authority to make changes to the existing bureaucratic structure unless they have been specifically delegated the power to do so by the legislative branch.