Which statement best reflects the concept of preemption in federal law?

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The main idea is that federal law wins over state law whenever there’s a conflict, because of the Supremacy Clause. This is the essence of preemption: the federal government, through its laws, occupies the highest position in the legal hierarchy, so when a state rule would interfere with or contradict a federal rule, the state rule cannot stand to the extent of the conflict. Preemption can happen in different ways—expressly, when a federal statute says it preempts state law; or implicitly, through field preemption (federal regulation covering an entire area) or conflict preemption (compliance with both is impossible or the state law stands as an obstacle to federal objectives). The statement that best captures this idea is that federal preemption comes from the supremacy of federal law over conflicting state law. For example, a nationwide federal regulation that sets a standard would preempt a state rule that tries to impose a different standard, to the extent of the conflict.