Why Might Officials Want to Regulate the Use of the Revolving

Why might officials want to regulate the use of the revolving door?

A) Too many donations to an interest group can be a sign of corruption.
B) It is easier to lobby the executive branch because of the number of bureaucrats.
C) Government officials might give lobbyists what they want in exchange for a future job.
D) Centralized interest groups have an easier time lobbying because they are more efficient.