The correct answer is: c) Autonomous tribal rule.
The Aka (Hrusso) chiefs of the West Kameng region maintained a form of autonomous tribal rule. This means that they were not under the direct control of any other government, but instead ruled their own territory according to their own customs and traditions.
A centralized monarchy is a form of government in which a single person, the monarch, holds all or most of the power. A feudal system is a form of government in which land is owned by a small number of powerful lords, who then grant land to their vassals in exchange for their loyalty and service. Direct British control is a form of government in which a country is ruled directly by the British government.
The Aka (Hrusso) chiefs of the West Kameng region did not fit any of these descriptions. They were not ruled by a single monarch, nor did they have a feudal system. They were also not under the direct control of the British government. Instead, they ruled their own territory according to their own customs and traditions.