Which of the following is a reserved power?

• A. Coin money
• B. Declare war
• C. Regulate interstate commerce
• D. Powers not delegated to the national government by the Constitution, reserved to the states or the people

Answer: (D)

This question tests the idea of reserved powers in the federal system. The Constitution assigns certain powers to the national government, and the Tenth Amendment says that powers not delegated to the federal government are reserved to the states or to the people. The statement describing reserved powers—“powers not delegated to the national government by the Constitution, reserved to the states or the people”—fits this principle exactly. The other options reflect powers that the federal government holds: coin money is a federal power, declaring war is a national prerogative, and regulating interstate commerce is granted to Congress. So the reserved-powers description is the correct answer because it captures who holds those unspecified powers.