I think the answer is a or d???
Answer: Indo-Europeans were originally from the Steppes. They were nomadic and pastoral people who tamed horses and rode chariots.
They lived in tribes. Participated in some type of organized armed conflict using trade items and the heads served not only as tools.
Interacted with each other through trade.
Hey There,
The Answer To Your Question Is: Volcanoes Ocean Ridges and Rift valleys
If This Helps May I Have Brainliest?