Option b is the correct answer. Mehrgarh is an ancient site located in the foothills of the Bolan Pass in Balochistan, Pakistan. It is one of the earliest sites with evidence of farming and herding in South Asia. It dates back to 7000 BCE and spans the period from the Stone Age to the Harappan Civilization. Archaeologists have found remains of domesticated animals, cultivated plants, pottery, copper tools, and burial practices at Mehrgarh. It is considered as one of the key sites for understanding the origins and development of the Indus Valley Civilization.