The Cycle Effect on Presidential Popularity Is Caused by the ______

The cycle effect on presidential popularity is caused by the ______.

A) fact that presidents always promise one thing while running but do something different when governing
B) fickle nature of the American public
C) fact that presidents inevitably turn out to be solely politicians
D) fact that almost every decision that presidents make will be unpopular with some people, and the number of people angry with presidents grows over time as they make more decisions
E) fact that presidents can pay off their supporters, and therefore, their popularity almost always increases during their term