The correct answer is: a) Adi.
The Adi are the largest Scheduled Tribe in Arunachal Pradesh, India. They are a Tibeto-Burman people who live in the central and eastern parts of the state. The Adi are divided into a number of sub-tribes, each with its own language and customs. The Adi are traditionally farmers and hunters, and they are known for their intricate woodcarvings and textiles.
The Nyishi are the second largest Scheduled Tribe in Arunachal Pradesh. They are a Tibeto-Burman people who live in the western part of the state. The Nyishi are divided into a number of sub-tribes, each with its own language and customs. The Nyishi are traditionally farmers and hunters, and they are known for their colorful festivals and dances.
The Galo are the third largest Scheduled Tribe in Arunachal Pradesh. They are a Tibeto-Burman people who live in the western part of the state. The Galo are divided into a number of sub-tribes, each with its own language and customs. The Galo are traditionally farmers and hunters, and they are known for their elaborate funeral ceremonies.
The Apatani are the fourth largest Scheduled Tribe in Arunachal Pradesh. They are a Tibeto-Burman people who live in the central part of the state. The Apatani are divided into a number of sub-tribes, each with its own language and customs. The Apatani are traditionally farmers and hunters, and they are known for their unique facial tattoos and their elaborate system of social organization.