Which statement best describes how federalism changed as a result of the federal government's response to the great depression?

a. a system of cooperative federalism emerged, as the powers of the federal government expanded.
b. the system of federalism remained relatively unchanged because the federal government took little action to resolve the economic crisis.
c. the system of federalism expanded, as the federal government established more concrete distinctions between the powers of the states and those of the federal government.
d. a system of dual federalism emerged, as the powers of individual state governments grew to match the powers of the federal government.