What is reserved for the states or the people according to the Tenth Amendment?

The Tenth Amendment to the United States Constitution is an important component of the Bill of Rights that emphasizes the principle of federalism by affirming that powers not delegated to the federal government by the Constitution are reserved for the states or the people. This means that any authority not specifically granted to the federal government is inherently maintained by state governments or by the individuals themselves. As such, the correct choice highlights the relationship between state rights and the limited powers of the federal government, reinforcing the idea that states and individuals retain rights and powers not expressly assigned to the national government.

The other options do not capture this foundational principle. The rights explicitly stated in the Constitution refer to enumerated rights but do not address the powers reserved to states or individuals. Rights related to national security pertain specifically to federal responsibilities and do not concern the states' reserved powers. Similarly, federal tax regulations are a matter of federal law and do not relate to the powers not delegated by the Constitution. Thus, the focus of the Tenth Amendment on non-delegated powers distinguishes the correct answer as the foundation of state and individual rights, emphasizing the structure of American governance.