This would be the 14th amendment.
Option A, the Tenth Amendment reserves the rights of the states, whereas the others only reserve the rights of the people, is the right answer.
Added on December 15, 1791, the Tenth Amendment was a part of the Bill of Rights. This amendment was introduced by the then president of the United States James Madison. The tenth amendment states that any authority that is not given to the federal government is given to the states or the people.
Yes, it is true that the progressive income tax was aggressively sought by the Populist Party, since they thought that this would free the common man from financial instability.