Brad, a citizen of California, obtains a federal license to operate a commercial fishing boat in a certain area off the coast. The California state legislature enacts a law that bans all commercial fishing in that area. The state law most likely violates

The supremacy clause.

Explanation:

In this case, given that Brad has a federal license (above the state one), the californian law that bans all fishing in that are is violating the Supremacy Clause from the U.S. Constitution, which dictates that all laws, traties, legislation, licenses etc made under it's authority are prioritized over any other state laws. Therefore, a state law (in this case from the state of California) is subordinate to the federal law dictated by the Constitution.

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