Answer:
C Three-fourths of the state legislatures ratify the amendment.
Step-by-step explanation:
The two steps involved in amending a Constitution are proposal and ratification.
The two legislative houses would propose an amendment with a two-thirds vote and the amendment would be ratified when three-fourths of the states approve it through ratifying conventions.
Therefore, the last step in amending the U.S. Constitution is three-fourths of the state legislatures ratify the amendment