Which of the following societies features a political arrangement most similar to that of the Mongols before the rise of Genghis Khan?
A. An oppressive empire that conquers and occupies all of its neighboring cities
B. A village populated by poor farmers, middle class merchants, and rich politicians
C. A region made up of competing tribes who fight each other for food and resources
D. A democratic city-state that allows its people to vote on laws and policies