Why was the concept of a written constitution central to the formation of the U. S. government?

A. It illustrated that the ideas for national laws should be gathered from the states.
B. It eliminated special councils where citizens had to serve as organizers or judges.
C. It demonstrated a way to lay out the rights of the people and process for justice.
D. It meant that only males over the age of 18 had the right to vote in the early years.