The Expansion of the Executive Office of the President, the Development

The expansion of the Executive Office of the President, the development of regulatory review, and the use of executive orders have been important because they

A) are deeply unpopular with the public and have led to the declining trust in American government.
B) make it very difficult for challengers to defeat incumbent presidents in elections.
C) have given presidents substantial capacity to achieve significant policy results despite congressional opposition to their legislative agendas.
D) have dramatically limited the power of the president and made it easier for Congress to dominate the American political system.