The correct answer is: c) Aniko.
The Idu Mishmi tribe is an indigenous people of the eastern Himalayas. They are found in the Indian states of Arunachal Pradesh and Assam, as well as in the neighboring country of Myanmar. The Idu Mishmi are a matrilineal society, which means that descent is traced through the mother’s line. The tribe traces its lineage to a mythical ancestor named Aniko, who is said to have descended from the sky. Aniko is said to have been a great warrior and leader, and he is credited with founding the Idu Mishmi people.
The other options are incorrect. Rukmini is a character in the Hindu epic Mahabharata. Abhiraja is a name that is found in several Indian texts, but it is not specifically associated with the Idu Mishmi tribe. Bhrigu is a sage in Hindu mythology, but he is not considered to be the ancestor of the Idu Mishmi people.
I hope this helps! Let me know if you have any other questions.