The correct answer is: b) Buddhism.
Sikkim is a state in northeastern India. It is bordered by Bhutan to the north, China to the east, Nepal to the west, and West Bengal to the south. The capital of Sikkim is Gangtok.
The predominant religion in Sikkim is Buddhism. According to the 2011 census, 81.5% of the population of Sikkim is Buddhist. The remaining 18.5% of the population is Hindu, Christian, Muslim, or of other religions.
Buddhism was introduced to Sikkim in the 8th century by Padmasambhava, also known as Guru Rinpoche. He is considered the founder of Tibetan Buddhism.
The main Buddhist monasteries in Sikkim are Rumtek Monastery, Enchey Monastery, and Phodong Monastery.
Rumtek Monastery is the largest and most important Buddhist monastery in Sikkim. It is the seat of the Karmapa, the head of the Karma Kagyu lineage of Tibetan Buddhism.
Enchey Monastery is a Gelugpa monastery located on a hill overlooking Gangtok. It is one of the oldest monasteries in Sikkim.
Phodong Monastery is a Nyingma monastery located in the Phodong Valley. It is one of the most important monasteries in the Nyingma lineage of Tibetan Buddhism.
Sikkim is a beautiful and peaceful state with a rich Buddhist heritage. If you are interested in Buddhism, I highly recommend visiting Sikkim.