Answer:
D. They had a pastoral economy.
Step-by-step explanation:
By 1500 BCE the Aryans relocated into the Indian subcontinent. Originating from focal Asia, this enormous gathering of itinerant cows herders crossed the Hindu Kush Mountains and interacted with the Indus Valley Civilization. This was a huge relocation and used to be viewed as an intrusion, which was accepted by certain researchers to be behind the breakdown of the Indus Valley Civilization; this theory isn't consistently acknowledged today.