Answer:
A. put limits on what government shall and shall not have the power to do.
Explanation:
The purpose of the creation of this constraints is to prevent the government from becoming to powerful and violate the rights of the citizens.
Small example of the constraints would be the right to privacy. The government has the duty to protect the citizens, but they had to do it without violating the citizens' right to be safe in their own space (the lpolice cannot take private information about us without proper order from the court)