Option 2: Assam -> The Doiyang Dhansiri Valley is an ancient archaeological site located in the Dhansiri Valley of Assam. This site holds significant historical importance with evidence of early human settlements and has yielded important archaeological findings from the Neolithic period. The Dhansiri River flows through the states of Nagaland and Assam, and the Doiyang site specifically falls within Assam's territory. -> correct