Answer:
C. Saudi Arabia.
Explanation:
Saudi Arabia is an hereditary, absolute monarchy. It´s ruled by the Al Saud family. The king is the head of state. The king performs executive, legislative and judicial functions. The monarchy is extremely powerful and citizens have very little rights. The political system is often critized by international human rights organizations for not granting all rights established by international conventions to its citizens.
Actually every single one is correct, A<B<C they all are factors in the decline of Sumer.