The correct answer is: a) Ahom dynasty.
The Ahom dynasty was a Tai-Ahom dynasty that ruled the Brahmaputra Valley in northeastern India from the 13th century to the 19th century. The Ahoms were originally from Yunnan in China, and they migrated to Assam in the 13th century. They established a kingdom in Assam that lasted for over 600 years.
The Ahoms were credited with building extensive forts and temples across Assam. The most famous of these forts is the Rangpur Fort, which was built in the 17th century. The Ahoms also built many temples, including the Kamakhya Temple, which is one of the most important Hindu temples in Assam.
The Ahom dynasty was a powerful and influential dynasty that left a lasting legacy on Assam. Their forts and temples are still standing today, and they are a reminder of the Ahoms’ rich history and culture.
The other options are incorrect because:
- The Koch dynasty was a Hindu dynasty that ruled the Brahmaputra Valley in northeastern India from the 15th century to the 17th century. The Koches were not credited with building extensive forts and temples across Assam.
- The Pala dynasty was a Buddhist dynasty that ruled the Bengal region in northeastern India from the 8th century to the 12th century. The Palas were not credited with building extensive forts and temples across Assam.
- The Dimasa dynasty was a Hindu dynasty that ruled the Kachari Hills in northeastern India from the 13th century to the 19th century. The Dimasas were not credited with building extensive forts and temples across Assam.