The correct answer is: b) Burmese occupation.
The Treaty of Yandaboo was signed on 24 February 1826 between the British East India Company and the Burmese Kingdom of Ava. The treaty ended the First Anglo-Burmese War and resulted in the cession of Arakan, Tenasserim, and the Coco Islands to the British. The treaty also marked the end of Burmese occupation of Assam.
Ahom rule was a period in the history of Assam when the Ahom people ruled the region from the 13th to the 18th centuries. The Ahoms were a Tai people who migrated from Yunnan in China to Assam in the 13th century. They established a powerful kingdom that lasted for over 500 years. The Ahoms were eventually overthrown by the Burmese in the 18th century.
Mughal rule was a period in the history of India when the Mughal Empire ruled the region from the 16th to the 18th centuries. The Mughals were a Muslim dynasty that originated in Central Asia. They established a powerful empire that stretched from Afghanistan to Bengal. The Mughals were eventually overthrown by the British in the 18th century.
The Koch kingdom was a kingdom that existed in the Brahmaputra Valley in the 16th and 17th centuries. The Koches were a Hindu people who ruled the region from their capital at Koch Bihar. The Koch kingdom was eventually overthrown by the Ahoms in the 17th century.