Option a is the correct answer. Burzahom is known for its pit dwellings, which were subterranean structures cut into the natural soil. The pits were circular or oval in plan, narrow at the top and wide at the base, and had post holes on the ground level to support a wooden cover. The pits were used as dwellings, storage, or ritual purposes. The pit dwellings are evidence of the adaptation of the Neolithic people to the cold climate of Kashmir. Important Tips Koldihwa: This is a prehistoric site in Uttar Pradesh, where evidence of rice cultivation dating back to 7 th millennium BCE has been found. Koldihwa also has remains of mud structures, pottery, and animal bones from the Chalcolithic period. Sanganakallu: This is a site in Karnataka where evidence of Neolithic and Megalithic cultures has been found. Sanganakallu has remains of stone circles, cairns, dolmens, and rock paintings. The site also shows signs of iron smelting and trade activities.