Concept:Identify the main festival of the Bhutia tribe of Sikkim from the given options.
Explanation:The Bhutia tribe is one of the principal tribes of Sikkim.
Their chief festival is Losoong, which is celebrated as the Sikkimese New Year.
It is held every year in December, at the end of the tenth Tibetan lunar month.
Losoong marks the completion of the harvest season and the closing of the Tibetan year.
The festival is observed with traditional dances and community gatherings.
Among the other options, Hornbill is a festival of Nagaland, Aoleang belongs to the Konyak Naga tribe, and Hega is not the main Bhutia festival of Sikkim.
Hence, the correct option is Losoong.
Answer:Option D: Losoong