The correct answer is: a) Varman Dynasty.
The Varman Dynasty was the first historically established dynasty of Assam. It was founded by Pushya Varman in the 4th century CE. The Varman rulers were Hindu and they patronized the arts and literature. They were also patrons of Buddhism. The Varman Dynasty came to an end in the 7th century CE.
The Pala Dynasty was a Buddhist dynasty that ruled over Bengal and Bihar from the 8th to the 12th centuries CE. The Pala rulers were patrons of Buddhism and they built many Buddhist temples and monasteries. The Pala Dynasty came to an end in the 12th century CE.
The Mlechchha Dynasty was a Hindu dynasty that ruled over Assam from the 7th to the 9th centuries CE. The Mlechchha rulers were not well-known and they did not leave behind any significant records. The Mlechchha Dynasty came to an end in the 9th century CE.
The Salastambha Dynasty was a Hindu dynasty that ruled over Assam from the 10th to the 12th centuries CE. The Salastambha rulers were patrons of Hinduism and they built many Hindu temples and monasteries. The Salastambha Dynasty came to an end in the 12th century CE.