The true statement about the amendment process is: Both the national government and the states are involved.
In the U.S. amendment process, an amendment can be proposed either by a two-thirds majority vote in both houses of Congress or by a constitutional convention called for by two-thirds of state legislatures. Once proposed, an amendment must then be ratified by three-fourths of the states (either by state legislatures or by conventions in the states). Therefore, both the national government and the states play a role in the amendment process.