Option a is the correct answer Sonauli is an archaeological site of Indus valley civilization. It has been discovered in Baghpat district of Uttar Pradesh. It is situated at the doab of Ganga and Yamuna rivers. The excavations first began in 2005 and within a year 116 burial sites were discovered. The coffins are 4 legged and the tombs had underground chambers. In the tombs are found systematically arranged vases, bowls and pots near the body. One thing that is extraordinary is that the burials were similar to vedic culture and not Indus Valley culture