B. It was the longest-lived written okay for representative government in history
Explanation:
The US Constitution is one of the longest-lasting Constitutions in the World which created a new form of government - Federalism - that has influenced countries all around the world.
The US Constitution was constructed so the process of Amendment was very difficult but not impossible, this is a key factor because the Framers did not want the main points of the Constitution to be changed, they wanted the Constitution to have “a soul” that would not be changed. This is also a key to a long-lasting Constitution.