The correct answer is (b), Sunder Lal Bahuguna.
Sunder Lal Bahuguna was an Indian environmentalist and activist who is considered one of the pioneers of the Chipko movement. He was born in 1927 in the village of Silyara in the Garhwal region of Uttarakhand, India. He was educated at the University of Allahabad, where he studied forestry. After graduating, he worked as a forest officer for the Indian government.
In the 1970s, Bahuguna became involved in the Chipko movement, which was a non-violent protest against the deforestation of the Himalayas. He led a group of women who hugged trees to prevent them from being cut down. The Chipko movement was successful in halting deforestation in many parts of the Himalayas.
Bahuguna was also a writer and an advocate for sustainable development. He wrote several books, including “Himalayan Odyssey” and “Chipko Andolan: A People’s Movement in Defence of Forests.” He died in 2009 at the age of 81.
The other options are incorrect.
(a) Pushpesh Pant is an Indian historian and writer. He is the author of several books on Indian history and culture.
(c) Chandi Prasad Bhatt is an Indian environmentalist and activist. He is the co-founder of the Chipko movement.
(d) Shekhar Pathak is an Indian journalist and author. He is the author of several books on Indian politics and society.