Option d is the correct answer One of the key reasons why archaeologists believe that the Indus Valley Civilization(IVC) should be placed before the Aryan Civilization is the evidence of pottery. The earliest pottery found in the IVC is dated to around 3300 BCE, while the earliest pottery found in association with the Aryans is dated to around 1500 BCE. This suggests that the IVC was already well established by the time the Aryans arrived in the Indian subcontinent.