Option d is the correct answer The Aryan migration theory says that the groups of nomadic tribal people from regions outside Indian sub-continent started migrating towards India around 1700 BC . These people are called Rig-Vedic Aryans because they brought with them the earliest portion of collection of hymns as RigVeda. Lokmanya Tilak in his book Arctic home of Vedas suggested Arctic region to be home of Aryans. Various others scholars and their suggested original homes are as follows: Max Muller - Central Asia Swami Dayanand Saraswati - Tibet Hurz Feld - Turkistan J C Rod - Bactria Lokmanya Tilak - Arctic region