Why Did Efforts to Partition Federal and State Responsibilities into Separate

Why did efforts to partition federal and state responsibilities into separate and self-contained spheres fail?

A) Maintaining a balance proved difficult, so it was easier to allow the national government to handle all policies.
B) Perceptions of inequality generated by different policies resulted in a move to more national policies.
C) The existing federalism was the only way to redistribute funds collected from the states.
D) Deciding government should provide more services and solve more problems undermined those efforts.