<span>B. keeping the money supply of the United States stable</span>
Im pretty sure it was the Maya, not 100% sure though.
They did it because they feared that without a specifically enumerated bill of rights that the government could become tyrannical in the same manner in which the British were tyrannical. They believed that rights of people and states should be written and stated officially instead of just being implied since implied things are easy to exploit and maneuver according to your needs.