The correct answer is: b) Bhutia origin.
Phuntsog Namgyal was a Bhutia leader who founded the Namgyal dynasty of Sikkim in 1642. He was born in the village of Yuksom in western Sikkim. His father, Tenzing Namgyal, was a Bhutia chief from the Nubri region of Tibet. His mother, Pema Dechen, was a Lepcha princess from the Namgyal clan.
Phuntsog Namgyal was a skilled warrior and diplomat. He united the warring Bhutia tribes of Sikkim and led them to victory over the Lepchas and the Nepalese. He also established friendly relations with the British East India Company.
Phuntsog Namgyal was a devout Buddhist. He built many temples and monasteries in Sikkim. He also introduced the Tibetan Buddhist system of government to Sikkim.
Phuntsog Namgyal died in 1670. He was succeeded by his son, Tenzing Namgyal. The Namgyal dynasty ruled Sikkim until 1975, when the monarchy was abolished.
The other options are incorrect because:
- Lepchas are an indigenous people of Sikkim. They are not related to the Bhutias.
- Nepalis are an ethnic group from Nepal. They are not related to the Bhutias.
- Bengalis are an ethnic group from Bangladesh and West Bengal, India. They are not related to the Bhutias.