The Seemingly Eternal Problem of "Revolving-Door Politics," Which Refers to the Frequent

The seemingly eternal problem of "revolving-door politics," which refers to the frequent rotation of elected officials and agency administrators and staff into lobbying jobs, is driven by:

A) the always enormous, and now increasing, sums of money spent in campaign finance.
B) the increasing size of the federal government, and its budget.
C) dissatisfaction with the current, ideologically polarized environment in government.
D) the continual turnover of staff, lobbyists, and even political parties in Washington.