They're known as Indo- Europeans.
Indo-Europeans is a general name for the people speaking an Indo-European language. They are (linguistic) descendants of the people of the Yamnaya culture in Ukraine and southern Russia, and settled in the area from Western Europe to India.
They raised cattle and horses. They were the first ones to domesticate horses, which increased their ability to travel and migrate
The correct answer for the question that is being presented above is this one: "c. The Byzantine emperor asked the pope for help in repelling Muslim invaders." The statement that accurately describes an event or belief that led to the First Crusade is this <span>c. The Byzantine emperor asked the pope for help in repelling Muslim invaders.</span>