The correct answer is C. Rachel Carson.
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 in the history of environmentalism. Silent Spring was published in 1962 and it helped to raise awareness of the dangers of pesticides. The book was a bestseller and it led to a ban on the use of DDT in the United States.
Madhav Gadgil is an Indian ecologist and environmental activist. He is a professor at the Indian Institute of Science, Bangalore. Anil Agarwal was an Indian economist and environmental activist. He was the founder of the Centre for Science and Environment, New Delhi. E.O. Wilson is an American biologist and naturalist. He is considered to be one of the world’s leading experts on ants. He is also the author of many books on natural history, including The Ants and Sociobiology.
Madhav Gadgil, Anil Agarwal, and E.O. Wilson are all respected scientists and environmental activists. However, none of them wrote the book Silent Spring. The book was written by Rachel Carson, who was a marine biologist and conservationist.