When did the aryans not remain in one place or location for very long

Aryans not remain in one place or location for very long when they were In hindu kushplace, 1000BC

Aryans are known for their migration. They are the speakers of Sanskrit. The Indo-Aryans did the expansion of Indus Valley . They also did the expansion of  Ganges Plain .this happened during 1800-1500 BCE.they are the people who actually migrated from different states and countries and settled in ganges.

They spoke mixed languages. Aryan means noble people. Some people in the group also called indo iranians were from Afghanistan. They started creating herds and settled in different parts of country. They migrated through places from year to year. They never built permanent houses and were very skilled. They were also the last prehistoric migrant to India. It's also been a much awaited and researched topic in the history.

answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;