c) Massachusetts

The U.S. Constitution drew significant inspiration from the Massachusetts State Constitution. Drafted in 1780 and largely written by John Adams, the Massachusetts Constitution is the oldest functioning written constitution in continuous effect. It served as a model for the U.S. Constitution, particularly in its principles of balanced government, separation of powers, and clear delineation of individual rights. The influence of the Massachusetts Constitution highlights the role of state constitutions in shaping the federal Constitution and the development of American constitutional thought.