Federalism, or the dual roles of state and national government, is part of the system of sharing power in government. within the system of separate powers, however, the framers of the constitution provided for supremacy.

Federalism, or the dual roles of state and national government, is part of the system of sharing power in government. Within the system of separate powers, however, the framers of the Constitution provided for "national" or "federal" supremacy. This meant that the national government was supreme in regards to many issues in relation to state governments, as enumerated by the Constitution. 

The answer is c. good luck : )