The correct option is D Patan
Rani ki Vav, situated on the banks of Saraswati river in Patan, Gujarat is a intricately constructed stepwell. It was initially built as a memorial to a king in the 11th century AD. It is an exceptional example of a distinctive form of subterranean water architecture of the Indian subcontinent. It was added to the list of UNESCO's World Heritage Sites on 22 June 2014.