Explanation:

Correct option 1: Nagalanda

The famous festival of Tsokum Samai is celebrated by the Khiamniungan tribe in the state of Nagaland, India. This annual, week-long festival is observed in the first week of October, marking the beginning of the harvest season. The festival is primarily celebrated in the Noklak district of Nagaland. Tsokum Samai is a pre-harvest festival where the community comes together to invoke blessings for a bountiful harvest. It involves various rituals, traditional dances, feasts, and the sharing of food, meat, and rice beer.