The correct answer is: a) Phuntsog Namgyal.
Phuntsog Namgyal was the founder of the Namgyal dynasty in Sikkim. He was born in 1570 in Kham, Tibet. In 1616, he led a group of Tibetan refugees to Sikkim, where he established the Namgyal dynasty. He ruled Sikkim from 1616 to 1642.
Tensung Namgyal was the second king of Sikkim. He was born in 1634 and ruled from 1642 to 1670. He was the son of Phuntsog Namgyal.
Chakdor Namgyal was the third king of Sikkim. He was born in 1646 and ruled from 1670 to 1700. He was the son of Tensung Namgyal.
Gyurmed Namgyal was the fourth king of Sikkim. He was born in 1675 and ruled from 1700 to 1717. He was the son of Chakdor Namgyal.
Phuntsog Namgyal was the founder of the Namgyal dynasty in Sikkim. He was a Tibetan refugee who led a group of Tibetans to Sikkim in 1616. He established the Namgyal dynasty and ruled Sikkim from 1616 to 1642. He was a wise and capable ruler who helped to establish Sikkim as a stable and prosperous kingdom.