The correct answer is: d) All of the above.
The Sadiya Khowa Gohain was an Ahom official responsible for governing the Sadiya region, overseeing trade routes, and managing relations with feudatory states. The Sadiya region was located in the easternmost part of the Ahom kingdom, and it was important for the Ahoms to maintain control of this region because it was a major trade route between Assam and Tibet. The Sadiya Khowa Gohain was responsible for collecting taxes, maintaining law and order, and defending the region from attack. He also had to manage relations with the feudatory states that were located in the Sadiya region. These feudatory states were not directly controlled by the Ahoms, but they were expected to pay tribute to the Ahoms and to provide military assistance when needed. The Sadiya Khowa Gohain was responsible for ensuring that these feudatory states remained loyal to the Ahoms.
The Sadiya Khowa Gohain was a powerful and important official in the Ahom kingdom. He was responsible for a large and important region, and he had a significant impact on the lives of the people who lived in that region.