The Assam Movement in the 1980s was largely a response to:

The correct answer is: a) Perceived threats from in-migration.

The Assam Movement was a six-year-long (1979–1985) agitation in the Indian state of Assam against alleged large-scale illegal immigration from Bangladesh. The movement was led by All Assam Students Union (AASU) and All Assam Gana Sangram Parishad (AAGSP). The movement was successful in getting the government to implement the Assam Accord, which provided for the detection and deportation of illegal immigrants from Bangladesh.

The movement was triggered by the perceived threat posed by illegal immigration to the cultural, economic, and political identity of Assamese people. The influx of illegal immigrants was seen as diluting the demographic balance of the state and leading to the displacement of Assamese people from their land. The movement also raised concerns about the impact of illegal immigration on the state’s economy and resources.

The Assam Movement was a significant event in the history of Assam and India. It was the first major mass movement in India to be led by students. The movement also had a significant impact on the politics of Assam and India. The Assam Accord, which was the outcome of the movement, has had a lasting impact on the state of Assam.

The other options are not correct because:

• Option b) Lack of economic development is not the main reason for the Assam Movement. The movement was not primarily about economic development, but about the perceived threat posed by illegal immigration.
• Option c) Cultural marginalization is not the main reason for the Assam Movement. The movement was not primarily about cultural marginalization, but about the perceived threat posed by illegal immigration.
• Option d) Environmental degradation is not the main reason for the Assam Movement. The movement was not primarily about environmental degradation, but about the perceived threat posed by illegal immigration.