An Important Reason That Federal Grants to the States Increased

An important reason that federal grants to the states increased over time was that

A) the federal government increasingly chose to deal with nationwide problems by setting policy at the national level but having state officials carry out the policy.
B) the federal government's power over the states had become increasingly restricted, and federal grants were now one of the only ways for the government to influence state policy.
C) the federal government had increasing amounts of tax revenue to spend, so it shared some with the states.
D) a downturn in the economy caused state tax revenues to decrease sharply, and states became more dependent on federal aid.
E) state officials wanted more influence over the creation of national policies.