The correct answer is: c) Nyokum.
The Nyokum festival is a major festival of the Nyishi tribe of Arunachal Pradesh, India. It is a 10-day festival that is celebrated every year in the month of January or February. The festival is a time for the Nyishi people to celebrate their culture and traditions. It is also a time for them to pray for good health, prosperity, and a bountiful harvest.
The Roppi folk dance is one of the most important dances performed during the Nyokum festival. The dance is performed by a group of men and women who wear traditional Nyishi costumes. The dancers move in a circle and perform intricate steps. The dance is a celebration of life and the beauty of nature.
The other options are incorrect because they are not festivals that are celebrated by the Nyishi tribe. Mopin is a festival of the Apatani tribe, Dree is a festival of the Mishmi tribe, and Solung is a festival of the Adi tribe.