The correct answer is: a) Bodo people.
The Bodoland movement was a political movement that advocated for a separate state for the Bodo people, an ethnic group native to the Indian state of Assam. The movement began in the 1960s and gained momentum in the 1980s. In 1993, the Indian government signed a peace accord with the Bodo Liberation Tigers (BLT), the main militant group involved in the movement. The accord led to the creation of the Bodoland Territorial Autonomous District (BTAD), a semi-autonomous region within Assam.
The Karbi people and the Dimasa people are also ethnic groups native to Assam. However, they did not participate in the Bodoland movement. The Karbi people have their own autonomous district, Karbi Anglong, while the Dimasa people have their own autonomous district, Dima Hasao.
The Bodoland movement was a complex and controversial issue. It was driven by a number of factors, including the Bodo people’s desire for greater autonomy, their sense of marginalization, and their grievances against the Assamese government. The movement had a significant impact on the state of Assam, and its legacy continues to be felt today.