(C) Uttarakhand
The Chipko Movement originated in the Himalayan region, which is now the state of Uttarakhand, where communities successfully resisted deforestation.
The source passage states: "The famous Chipko movement in the Himalayas has not only successfully resisted deforestation in several areas..." The Himalayas reference here points to Uttarakhand (formerly part of Uttar Pradesh). Examiners expect direct recall of this fact — just mark (C) and optionally add one supporting line.