The correct answer is A) Aryans.
Some historians believe the caste system developed as a result of new rules and laws brought on by the invasion of the nomadic society known as the Aryans.
As we know through history, the Aryans migrated to form the Middle East and arrived at what today is India. It was one of the largest migrations in ancient history.
This Ido-Aryans spread all over the northern territory of India and reached modern-day, Bangladesh and Pakistan. These Aryans arrived at the territories once settled by the Harappans during the Indus Valley Civilization.
When they arrived, the Aryans shared their culture, customs, language, and traditions all over that region, including the caste system that influenced India.
