The correct answer is C) the 22nd Amendment.
Washington served only 2 terms as president, though the Constitution did not impose this limit. The amendment later limited the terms of the president to two terms was the 22nd Amendment.
To limit the times the United States President can be in charge, the 22nd Amendment of the United States Constitution established the term limits. It was passed on March 21, 1947, but was ratified by the states until February 27, 1951. The amendment only authorizes the same President to two terms, and that's it.