A major festival celebrated by many tribes in Arunachal Pradesh is:

Mopin
Solung
Nyokum
All of the above

The correct answer is: d) All of the above

Mopin, Solung, and Nyokum are all major festivals celebrated by many tribes in Arunachal Pradesh.

Mopin is a festival celebrated by the Apatani tribe in Arunachal Pradesh. It is a harvest festival that is celebrated in the month of November. The festival is a time for thanksgiving and for celebrating the good harvest. It is also a time for social gatherings and for young people to find partners.

Solung is a festival celebrated by the Nyishi tribe in Arunachal Pradesh. It is a harvest festival that is celebrated in the month of December. The festival is a time for thanksgiving and for celebrating the good harvest. It is also a time for social gatherings and for young people to find partners.

Nyokum is a festival celebrated by the Adi tribe in Arunachal Pradesh. It is a harvest festival that is celebrated in the month of January. The festival is a time for thanksgiving and for celebrating the good harvest. It is also a time for social gatherings and for young people to find partners.

All three festivals are important cultural events for the tribes that celebrate them. They are a time for people to come together and celebrate their culture and traditions. They are also a time for people to give thanks for the good harvest and to pray for a good year ahead.