Explanation

Option C is correct: Sohgaura is located on the Rapti River in the Gorakhpur district of Uttar Pradesh. It is renowned for the famous Sohgaura copper-plate inscription dating to the Mauryan era (written in Prakrit in the Brahmi script mentioning famine relief storehouses), and is not an Indus Valley (Harappan) civilization site.

– Chanhudaro: An important Mature Harappan manufacturing center in Sindh (Pakistan), specialized in bead-making, seal-making, and shell-working.
– Kot Diji: An Early and Mature Harappan archaeological settlement in Sindh, Pakistan.
– Desalpur: A mature Harappan fortified settlement located in the Kutch district of Gujarat, India.

Hence, the site that is not Harappan is Sohgaura — Option C.