Answer:
A. "The powers not delegated to the United States by the Constitution, … are reserved to the States …" is the correct answer.
Step-by-step explanation:
The above mentioned line is taken from the tenth amendment. It was part of the Bill of rights and was added to the constitution on Dec 15, 1791. It specifies the power of state and federal government.
Most of the countries around the world today have the federal form of government. In US federal government, the power is shared between the state and federal government. The Federal governments power are mentioned in the constitution and is called express powers. It includes the right to levy taxes, regulate interstate commerce etc. The Necessary and Proper clause also gives the implied powers to the federal government for execution of its express powers.
"The powers not delegated to the United States by the Constitution, … are reserved to the States" deals with the powers that are reserved for states.