Multistate Bar Examination Practice Question

The correct answer is based on the concept of federal preemption under the Supremacy Clause. The Supremacy Clause of the Constitution establishes that federal law takes precedence over conflicting state laws. Preemption can occur explicitly when Congress includes a preemption clause in legislation or implicitly when compliance with both state and federal requirements is impossible or when state law stands as an obstacle to the purposes of the federal law. In this scenario, the federal law's goal of uniformity in labeling directly conflicts with the state's additional requirements, making the state law preempted. Other answers are incorrect as they either misstate the principle or represent unrelated legal concepts, such as state sovereignty or procedural fairness.