Which aspect of federalism best accommodates diversity?

Question

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The reserved and concurrent powers granted to the states under federalism allow for a diversity of policies and approaches to be implemented at the state and local level. This allows for different communities to have different solutions and policies based on their unique needs and values, which accommodates diversity. The ability of the federal government to exert the doctrine of preemption (A) and the supremacy clause provision (B) both emphasize federal power over state power, limiting the diversity of policies that can be implemented locally. While local governments do have power granted by the Constitution (C), it is limited compared to the reserved and concurrent powers granted to the states.

Which Aspect of Federalism Best Accommodates Diversity