Nomadic society and authority was based upon what kind of organization?
emperor
tribal or clan
dictator

The correct answer is tribal or clan.
Since a nomadic society consists of people who move as a group with their livestock in search of arable lands that their cattle can graze on, many of these groups are families called bands or tribes. They are called this way because they have kinship, meaning they are tied together by blood or by marriage. Sometimes they can be formed by close friendships where people have agreed to be banded with each other. Usually a group of adult males makes the tribes decisions, although this varies, as some tribes have chiefs.

The answer to the question is a.