The correct answer is: C. 3500 BC
Pottery was developed in the Indus Valley around 3500 BC. The earliest pottery found in the Indus Valley is simple, undecorated earthenware. Over time, pottery became more sophisticated, with the development of wheel-thrown pottery and the use of glazes. Pottery was used for a variety of purposes, including cooking, storage, and ritual.
Option A: 5000 BC is too early. The earliest evidence of human habitation in the Indus Valley dates to around 7000 BC. However, pottery was not developed until around 3500 BC.
Option B: 6000 BC is also too early. The earliest evidence of pottery in the Indus Valley dates to around 3500 BC.
Option D: 2600 BC is too late. The Indus Valley Civilization began to decline around 1900 BC. Pottery was still being produced in the Indus Valley after this time, but it was not as sophisticated as it had been during the height of the Indus Valley Civilization.