Government's Ability to Improve the Economy,especially near Elections,are Made Difficult

Government's ability to improve the economy,especially near elections,are made difficult because

A) governments lack the ability to affect the economy.
B) many improvements to the economy are mutually exclusive.
C) it is illegal to use government policy to affect elections.
D) changes to economic policy are frequently reversed after elections.
E) presidents prefer to ignore the economy in favor of foreign affairs in election years.