yes....... it is the answer is b.
It used oligarchy, rule by a few.
Legislature
A representative assembly of persons that makes statutory laws for a municipality, state, or nation.
A legislature is the embodiment of the doctrine of popular sovereignty, which recognizes that the people are the source of all political power. Citizens choose by popular vote the legislators, or representatives, whom they want to serve them. The representatives are expected to be sensitive to the needs of their constituents and to represent their constituents' interests in the legislature.
Islam gained momentum during the 10th century in West Africa
