To answer this question, you need to be familiar with the social activist Medha Patkar and her work.
Option A) Krishna - This option is incorrect. Medha Patkar is not associated with the Krishna River.
Option B) Indus - This option is incorrect. Medha Patkar is not associated with the Indus River.
Option C) Narmada - This option is correct. Medha Patkar is primarily known for her activism and advocacy work related to the Narmada River, particularly the Narmada Bachao Andolan (Save Narmada Movement) in India.
Option D) Brahmaputra - This option is incorrect. Medha Patkar is not associated with the Brahmaputra River.
The correct answer is C) Narmada. This option is correct because Medha Patkar is closely associated with the Narmada River and has worked extensively to raise awareness about the environmental and social issues surrounding its development.