The correct answer for above statement is:
It is the division of powers between a national government and the state governments" is the best option in terms of the description of federalism, on which the US government is based.
Explanation:
Federalism is the combined or composite method of government, connecting a global management (the central or 'federal' government) with provincial governments (provincial, state, cantonal, regional or other sub-unit governments) in a single political system. Its distinguishing feature, represented in the founding example of modern federalism by the United States of America under the Constitution of 1787, is a relationship of parity between the two levels of management established. It can thus be defined as a form of government in which there is a separation of powers between two levels of administration of equal rank
It is the division of powers between a national government and the state governments.
Federalism is a type of government where a national government has power but there is also state or provincial governments which share power.
The US government is an example of a federalist government. The national government is dictated by the Constitution and any powers not given to the national government are then given to the states. The states are also expected to set up their own constitutions describing their power. In the US system the Supremacy Clause gives the national government power over state laws and therefore laws passed at the state level which violate or contradict the national laws can be overturned by the national government.