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The case of District of Columbia v. Heller significantly clarified the interpretation of the Second Amendment and its application at the federal and state levels. The Supreme Court's ruling established that individuals have a right to possess firearms for self-defense within the home, thereby reinforcing an individual right to bear arms that is protected against government infringement.

Option B is correct because the ruling effectively limited the states' ability to impose certain restrictions on firearm ownership that would infringe on this individual right. By affirming that the Second Amendment protects an individual's right to keep and bear arms, the Court curtailed the extent to which states can implement laws that overly restrict this right, thus impacting states' rights in the context of gun control.

This ruling did not empower states to create stricter gun laws nor did it endorse local regulations that could impede this constitutional right. Instead, it set a precedent that individual rights under the Second Amendment take precedence over state regulations that attempt to restrict those rights.