Correct answer:
D. The Constitution can be changed if those changes have widespread support in Congress and the states.
Further explanation:
Changing the Constitution of the United States is an intentionally difficult process in which an amendment must be proposed and approved by 2/3 of Congress or 2/3 of the state legislatures before being ratified by 3/4 of the States. Normal bills passed by Congress become law with the signature of the President. Amendments to the Constitution, however, require a more stringent process, as described in the passage quoted from the Constitution.