The Massachusetts Constitution, Though Amended, Is the Only Constitution of the Original

The Massachusetts constitution, though amended, is the only constitution of the original thirteen states that still exists, because

A) Massachusetts is a very politically active state.
B) of the complicated procedures required before it can be replaced.
C) of the foresight of the drafter, John Adams, who grounded the document in extensive research of governments that took him all the way back to the ancients and the Magna Carta.
D) of an unwillingness to adjust to new ways.