The Nyokum festival of the Nyishi tribe is a celebration of:

Community, prosperity, and the goddess Nyokum
Warfare and victory
Ancestral spirits
The coming of spring

The correct answer is: a) Community, prosperity, and the goddess Nyokum.

The Nyokum festival is a major annual festival of the Nyishi tribe in Arunachal Pradesh, India. It is a celebration of community, prosperity, and the goddess Nyokum. The festival is held over a period of nine days and nights, and is marked by feasting, dancing, singing, and traditional games. The highlight of the festival is the sacrifice of a mithun (a type of wild cow) to Nyokum. The Nyokum festival is a time for the Nyishi people to come together and celebrate their culture and traditions. It is also a time to pray for good health, prosperity, and a bountiful harvest.

Option b) is incorrect because the Nyokum festival is not a celebration of warfare and victory. The festival is a time for peace and harmony.

Option c) is incorrect because the Nyokum festival is not a celebration of ancestral spirits. The festival is a celebration of the goddess Nyokum.

Option d) is incorrect because the Nyokum festival is not a celebration of the coming of spring. The festival is held in the winter.