The correct answer is: a) Ahom Dynasty.
The Ahom Dynasty was a Tai-Shan dynasty that ruled over the Brahmaputra Valley in northeastern India from the 13th century to the 19th century. The Ahoms were originally from the Yunnan province of China, and they migrated to Assam in the 13th century. They established their capital at Sibsagar, and they ruled over the Brahmaputra Valley for over 600 years. The Ahoms were a powerful and influential dynasty, and they played a major role in the history of Assam.
The Sena Dynasty was a Hindu dynasty that ruled over parts of India from the 11th to the 13th centuries. The Senas were originally from Bengal, and they established their capital at Gaur. They ruled over a large territory that included Bengal, Bihar, and Orissa. The Senas were a powerful and influential dynasty, and they made significant contributions to Indian art, architecture, and literature.
The Chutiya Dynasty was a Hindu dynasty that ruled over parts of Assam from the 12th to the 16th centuries. The Chutiyas were originally from the Kachari Hills, and they established their capital at Sadiya. They ruled over a large territory that included the Brahmaputra Valley and the Kachari Hills. The Chutiyas were a powerful and influential dynasty, and they made significant contributions to Assamese culture.
Tibetan rulers did not establish their rule in the Brahmaputra Valley in the 13th century.