Why was the supremacy clause considered to be "the root of federalism"?

A. It describes the relationship between federal and state power

B. It outlines the basic rights due to every American citizen

C. It lists the powers that are directly reserved for each of the states

D. It identifies the "supreme law of the land" as the US president

Option A.

Explanation:

It describes the relationship between federal and state power, is the right answer.

The Supremacy Clause to the Constitution of the United States can be located in the Paragraph Second of Article Sixth. This Clause arranges the relationship between federal and state legislature so that it could prevail transparently. According to this clause, the federal regulations are the highest judicature of the nation and thus all states, federal administrators and justices are consolidated by it, which implies that in case of a conflict between the regulations of federal and state legislature, the federal enactment is the one that shall govern.

The answer to your question is,

A. It describes the relationship between federal and state power.

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