Option a is the correct answer. As per the archaeological evidence from sites such as Nevasa, Daimabad, and Inamgaon in Maharashtra, the Chalcolithic people buried their dead in urns beneath the floor of their house in the north-to-south position. They did not use separate cemeteries for this purpose, as was the case with the Harappans. The burial orientation may reflect some religious or cultural beliefs of these people, but the exact meaning is not clear.