Answer:
The good choice is C.
Explanation:
In democratic political practice since the 19 century, it´s become a established tradition that each country must have its own constitution as the greatest law of the nation. It is the legal foundation of the powers and obligations of a government, but not only; it lists the main principles on which the state is built, it defines citizens´ rights are freedoms, it fixes the separation of powers and checks and balances.