The correct answer is A. Salim Ali.
Salim Ali was an Indian ornithologist and conservationist who is considered the father of Indian ornithology. He is known for his work on the birds of India, including his 10-volume book The Birds of India and Pakistan. He was also a founder of the Bombay Natural History Society and the Indian Ornithological Society.
M.S. Swaminathan is an Indian agricultural scientist who is known as the “Father of the Green Revolution”. He is credited with helping to increase food production in India and other developing countries.
M.C. Mehta is an Indian lawyer and environmentalist who is known for his work on environmental issues, including air pollution and water pollution.
Raphel Emerson is an American poet and essayist. He is known for his work on nature and the environment.
Salim Ali is the correct answer because he is the most well-known and respected ornithologist in India. He is also the only person among the options who is known as the “Bird Man of India”.