The correct answer is C. Sunderlal Bahuguna.
Sunderlal Bahuguna was an Indian environmentalist and activist who was one of the pioneers of the Chipko Movement, a non-violent resistance movement against deforestation in the Himalayas. He is best known for coining the slogan “Ecology is Permanent Economy”.
Jawaharlal Nehru was the first Prime Minister of India. He was a socialist and a secularist who played a major role in the Indian independence movement. He was not involved in the Chipko Movement.
Salim Ali was an Indian ornithologist and conservationist. He is known as the “Father of Indian Ornithology”. He was not involved in the Chipko Movement.
Rachel Carson was an American marine biologist and conservationist. She is best known for her book Silent Spring, which is considered to be one of the most influential books on environmentalism. She was not involved in the Chipko Movement.