The correct answer is: a) Kamarupa Kingdom
The Kamarupa Kingdom was a major power in the eastern Indian subcontinent from the 3rd century CE to the 13th century CE. It was located in the Brahmaputra Valley, which is now part of the Indian state of Assam. The kingdom was founded by the Varman dynasty, which ruled for over 600 years. The Varmans were patrons of Hinduism and Sanskrit culture, and they built many temples and monasteries in the kingdom.
The spread of Hinduism and Sanskrit culture in ancient Assam is attributed to the Kamarupa Kingdom. The Varman rulers were patrons of Hinduism and Sanskrit culture, and they built many temples and monasteries in the kingdom. This helped to spread Hinduism and Sanskrit culture among the people of Assam.
The other options are incorrect.
- Option b, Invasion of the Ahoms, is incorrect because the Ahoms did not invade Assam until the 13th century CE, after the Kamarupa Kingdom had already declined.
- Option c, Influence of Southeast Asia, is incorrect because there is no evidence that Southeast Asia had a significant influence on the spread of Hinduism and Sanskrit culture in ancient Assam.
- Option d, Arrival of Jain monks, is incorrect because Jainism was not a major religion in ancient Assam.