What takes the approval of two thirds of the congress and three-fourths of the states?

C. Changes or amendments to the constitution

Explanation:

The Constitution provides that an amendment may be proposed either by the Congress with a two-thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two-thirds of the State legislatures.

19th amendment granted women the right to vote. the 19th amendment guarantees all american women the right to vote.