Concentration camp imprisonment is the correct answer.
Explanation:
Concentration Camps were used for political prisoners and members of minority groups. They were confined in the camps fro punishment on basis of identification with a particular political or ethnic group. Thy were not even provided the benefit of fair trial. They are different from prison as in prison only those people who are lawfully convicted of crimes are kept. During second world war pogrom against Jews was initiated in Germany. They were put into concentration camps and killed. This picture also depicts the image of a concentration camps. Killing of Jews was known as Final Solution.
Answer: The hierarchical nature of the political structure was ideal for the system of indirect rule because the British could control the emirs and the emirs in turn could control their people.