Who won Stockholm Water Prize in 2015 for his/her contribution in water harvesting and conservation ?

Correct option is A

The correct answer is Rajendra singh.
Rajendra Singh won the Stockholm Water Prize in 2015 for his water harvesting and conservation contribution. He is also known as the "Water Man of India" and has dedicated his life to conserving water resources.
Singh founded the organization "Tarun Bharat Sangh," which has helped revive several rivers in Rajasthan through community-led water harvesting methods. He has also been recognized with several other awards for his work, including the Ramon Magsaysay Award and the Padma Shri. The Stockholm Water Prize is considered one of the most prestigious awards in the field of water. It is awarded annually to individuals or organizations for their outstanding contributions to the conservation and protection of water resources.