The correct answer is “Uttar Pradesh”.
The Harappan civilization site of Mandi is located in the Muzaffarnagar district of Uttar Pradesh, India.
It is notable for the discovery and looting of an ancient treasure trove by villagers in June 2000.
The treasure is believed to have been from the Indus Valley Civilisation period. It is known as "Mandi treasure" or "Mandy hoard".