The correct answer is Medha Patkar.
Medha Patkar is an Indian social activist who is best known for her work with the Narmada Bachao Andolan (NBA), a movement that opposed the construction of the Sardar Sarovar Dam on the Narmada River. The NBA was successful in delaying the construction of the dam, and Patkar has been recognized for her work with the movement with numerous awards, including the Right Livelihood Award and the Goldman Environmental Prize.
Arundhati Roy is an Indian author and activist who is best known for her novel The God of Small Things. Roy has also written extensively on political and environmental issues, and she is a vocal critic of the Indian government.
Vandana Shiva is an Indian environmental activist and philosopher who is best known for her work on issues related to biodiversity, agriculture, and intellectual property rights. Shiva is the founder of the Research Foundation for Science, Technology and Ecology, and she has written extensively on environmental issues.
Sunita Narain is an Indian environmentalist who is the director of the Centre for Science and Environment. Narain is a leading voice on issues related to climate change, air pollution, and sustainable development.
All four of these women are accomplished activists who have made significant contributions to the environmental movement. However, only Medha Patkar is the founder of the Narmada Bachao Andolan.