The Tenth Amendment gives the rights not expressly delegated to the federal government to the:

states

Speaker of the House

Supreme Court

president

The tenth Amendment (part of the Bill of Rights and ratified in 1791) specifically states that all the powers not expressly delegated to the federal government are reserved "to the States or to the people) - so the correct answer is "states"

All theother options mention members of the federal government so they can't be correct.