The correct answer is: c) Varman Dynasty.
The Mahabhairav Temple is a Hindu temple located in Tezpur, Assam, India. It is dedicated to the god Shiva. The temple was built by the Varman Dynasty in the 7th century. The temple is a fine example of early medieval architecture. It is made of sandstone and is decorated with intricate carvings. The temple is a popular pilgrimage destination.
The Salastambha Dynasty was a dynasty that ruled over parts of central India from the 2nd century BCE to the 4th century CE. The Pala Dynasty was a dynasty that ruled over parts of eastern India from the 8th century to the 12th century CE. The Ahom Dynasty was a dynasty that ruled over Assam from the 13th century to the 19th century CE.
The Salastambha Dynasty is not known to have built any temples in Tezpur. The Pala Dynasty is known to have built a number of temples in eastern India, but none of them are located in Tezpur. The Ahom Dynasty is known to have built a number of temples in Assam, but none of them are as old as the Mahabhairav Temple.
Therefore, the Varman Dynasty is the most likely candidate for having built the Mahabhairav Temple.