The purpose of the Supremacy Clause, found in Article VI, Clause 2 of the United States Constitution, is primarily to establish the Constitution, federal laws, and treaties as the supreme law of the land. This means that when there is a conflict between federal law and state law, federal law prevails. Therefore, the most accurate option is:
b. to establish the Constitution as the law of the country.
It does not, however, "establish a federal system of government" (option c) in the sense of creating the system itself; that was done earlier in the Constitution. Instead, the Supremacy Clause reinforces the hierarchy of law by ensuring that federal law takes precedence over conflicting state law, effectively supporting the federal system by limiting state powers when they conflict with federal authority.
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