The correct answer is: a) Greater autonomy within Assam.
The early tribal movements in Meghalaya were largely concerned with gaining greater autonomy from the Assamese government. They felt that the Assamese government was not adequately representing their interests and that they were being discriminated against. The movements also sought to preserve their traditional culture and way of life.
Option b) is incorrect because the early tribal movements in Meghalaya did not seek separation from India. They were concerned with gaining greater autonomy within India, not with independence.
Option c) is incorrect because universal education was not a major demand of the early tribal movements in Meghalaya. While they did want to improve education in their communities, this was not their primary focus.
Option d) is incorrect because the abolition of land taxes was not a major demand of the early tribal movements in Meghalaya. While they did want to reduce the burden of taxation, this was not their primary focus.