During whose reign was the Rang Ghar reconstructed using bricks and mortar? 

Correct option is D

• The Rang Ghar, a historic amphitheater in Assam, was originally constructed using bamboo and wood during the reign of Swargadeo Rudra Singha.
• However, it was later rebuilt with bricks and mortar during the reign of Swargadeo Pramatta Singha between 1744 and 1751 A.D.
• This structure is one of the oldest surviving amphitheaters in Asia and was used by Ahom kings and nobles to watch traditional sports like buffalo fights, especially during the Rongali Bihu festival.