The correct statement about the amendment process is:
Both the national government and the states are involved.
In the U.S. Constitution, amendments can be proposed either by 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. Once proposed, an amendment must be ratified by three-fourths of the state legislatures or by conventions in three-fourths of the states. Thus, both levels of government play a role in the amendment process.