In the Modern Era, Congress Can Still Issue Extensive Rules

In the modern era, Congress can still issue extensive rules for executive agencies to follow, as it did in earlier times.Since the New Deal era of Franklin D.Roosevelt and growth of the federal government, however, it has been more likely to give the executive branch broad grants of authority to carry out policy goals.Although Congress has usually given these delegated powers to specific agencies, presidents have:

A) often unconstitutionally usurped these powers, with congressional acquiescence.
B) successfully taken these powers from agencies through signing statements.
C) successfully stripped these powers from agencies through use of the line-item veto.
D) found ways to take quite a few of these powers for themselves.