The correct answer is: a) A separate state for tribal groups.
The Hill State Movement was a political movement that took place in the Indian state of Meghalaya in the 1960s and 1970s. The movement was led by the Khasi and Jaintia Hills Autonomous District Councils, and it sought to establish a separate state for the tribal peoples of Meghalaya. The movement was successful, and Meghalaya was granted statehood in 1972.
The main reason for the Hill State Movement was the desire of the tribal peoples of Meghalaya to have greater autonomy over their own affairs. The tribal peoples felt that they were being discriminated against by the government of the state of Assam, which they were a part of at the time. They also felt that their culture and traditions were being threatened by the influx of non-tribal people into the state.
The Hill State Movement was a peaceful movement, and it was largely successful in achieving its goals. Meghalaya was granted statehood in 1972, and the tribal peoples of the state now have greater autonomy over their own affairs.
The other options are incorrect because they do not accurately reflect the goals of the Hill State Movement. Option b) is incorrect because the Hill State Movement did not seek nationalization of industries. Option c) is incorrect because the Hill State Movement did not seek land redistribution. Option d) is incorrect because the Hill State Movement did not seek reservation policies.