Correct Answer: (b) Kaimur
Solution:In November 2018, Dr. Shyam Sundar Tiwary, a researcher of some valley civilization, discovered six, megalithic burial sites on Kaimur hills near Rohtas district, 205 km south-west of Patna. After further excavations, a group of archeologists headed towards Kaimur in July 2019 to document Bihar as a megalithic state.