The correct answer is: a) Ahom rule.
The Moamoria rebellion was a significant uprising against Ahom rule in Assam in the 18th century. The rebels were led by the Moamoria brothers, who were members of the Moran tribe. The rebellion was caused by a number of factors, including Ahom oppression of the Morans, economic hardship, and the decline of the Ahom kingdom. The rebellion lasted for several years and resulted in the overthrow of the Ahom dynasty.
The other options are incorrect. Option b) is incorrect because the Moamoria rebellion was not against British colonial forces. The British did not arrive in Assam until the early 19th century, after the Moamoria rebellion had ended. Option c) is incorrect because the Moamoria rebellion was not against Burmese invaders. The Burmese invaded Assam in the late 18th century, but the Moamoria rebellion had already ended by that time. Option d) is incorrect because the Moamoria rebellion was not against religious oppression. The Moamoria rebels were not motivated by religious beliefs, but by political and economic factors.