National Authority Has Greatly Expanded in the 20th Century,in Large

National authority has greatly expanded in the 20th century,in large part because

A) the states and the federal government have become increasingly interdependent.
B) constitutional amendments have opened the way for wider application of national authority.
C) the state governments have shown themselves to be an ineffective level of government.
D) the Democrats have been in control of Congress for most of the century.
E) Americans like the idea of "big government."