The correct answer is A) federal supremacy.
[Congress shall have power] to regulate Commerce with foreign Nations, and among the several States. <em>This excerpt reinforces the idea of federal supremacy.</em>
We are referring to the Supremacy Clause of the Constitution.
Article VI, clause 2, states that federal laws and treaties made under the authority of the United States Constitution are the supreme law of the land. This means that local and state governments are under the authority of the US Constitution, and if there would be a conflict between the parts, the US Constitution is the supreme law of the nation, the maximum authority. Among its powers is the regulation of trade with other countries and internally, among the states of the Union.
