Ratifying an amendment takes __________ of state legislatures or both houses of congress, whereas proposing an amendment requires only __________ of state legislatures or both Houses of Congress.

Ratification requires approval by three-fourths of the states, either through their legislatures or through state conventions. Proposing an amendment requires a two-thirds vote in both houses of Congress (or a convention called by two-thirds of the state legislatures). So the correct choice is “three-fourths . . . two-thirds.”

AI-written and checked against the verified answer.