Option b is the correct answer. Dholavira site was discovered by J.P Joshi and R.S Bisht. It is located in Kutch district of, Gujarat. It has Giant water reservoir and unique advanced water harnessing system. It is the latest Indus Valley Civilization city to be discovered. It is 40th site in India under UNESCO World Heritage Sites list. Important Tips Lothal: In 1954, it was discovered by S.R Rao. It is located on Bhogava river, a tributary of Sabarmati river in Gujarat It Was an important trade centre of the Indus Valley Civilization. It has Artificial dockyard There is evidence of rice cultivation and also of double Kalibangan: It was Discovered by B.B. Lal. It is located on river Ghaggar in Rajasthan There is evidence ofCamelbones and Plough field (Oldest plough field in India.) Alamgirpur: It is located on river Yamuna in Uttar Pradesh It is Easternmost site of IVC There is evidence of broken blade made up of copper, ceramic items and impression of cloth on a trough