Which of the Following Is the Best Explanation Why Presidents

Which of the following is the best explanation why presidents usually become quite unpopular over the course of their terms?

A) Presidents generate popular support by promising to undertake important programs, but presidential performance often falls short of those promises.
B) At some point in their terms, most presidents have been impeached by Congress with a resulting drop in the polls.
C) Reporters typically turn against second-term presidents, providing a steady stream of negative coverage.
D) Once reelected, presidents often lose interest in their duties and begin planning for their post-office career and setting up a presidential library.
E) Top White House aides tend to leave presidents and become lobbyists, leaving unskilled staffers to replace them.