Hello! :)
Brahmins.
Why?
Here is the highest social status to lowest so highest is Brahmins.
Nevertheless, the four varnas, from the top down, were: the Brahmins—Aryans (priests, scholars, and philosophers); the Kshatriyas—Aryans (rulers and warriors); the Vaishyas—Aryans (farmers, traders, merchants, and craftsmen); and the lowest caste, the Shudras—non-Aryans (laborers, peasants, and servants for the other.
Hope this helped and I hope I answered in time!
Good luck!
~ Destiny ^_^