Answer:
The adopted Dravidian customs and language.
Step-by-step explanation:
The Aryan civilization was mostly concentrated on the northern part of modern day India. The Dravidian civilization was mostly concentrated on the southern part of modern day India.
The Indian river valleys connected these two regions.
So, when the people from Aryan civilizations conducted their activities in the Indian river valleys, they got in touch with the Dravidian people. During their interaction, a cultural exchange occurred between the two civilizations and Aryan people adopted some characteristics of Dravidian customs and language.