A Sikkim social activist who worked for tribal rights and women’s empowerment was:

Kunzang Choden
Mayel Lyang Lepcha
Nar Bahadur Bhandari
Passang Droma Bhutia

The correct answer is: a) Kunzang Choden.

Kunzang Choden is a Sikkimese social activist who worked for tribal rights and women’s empowerment. She is the founder of the NGO Women’s Action for Development (WAD), which works to improve the lives of women in Sikkim. She has also been a vocal advocate for the rights of tribal people in Sikkim.

Mayel Lyang Lepcha is a Sikkimese politician who has served as a member of the Sikkim Legislative Assembly. She is a member of the Sikkim Democratic Front party.

Nar Bahadur Bhandari is a Nepalese politician who served as the Prime Minister of Nepal from 1990 to 1991 and again from 1999 to 2001. He is a member of the Nepali Congress party.

Passang Droma Bhutia is a Sikkimese politician who has served as a member of the Sikkim Legislative Assembly. She is a member of the Sikkim Krantikari Morcha party.

Kunzang Choden is the most likely answer to the question because she is a Sikkimese social activist who worked for tribal rights and women’s empowerment. She is the founder of the NGO Women’s Action for Development (WAD), which works to improve the lives of women in Sikkim. She has also been a vocal advocate for the rights of tribal people in Sikkim.