Step 1: Historical context.
The Chipko Movement (hug-the-trees movement) began in the early 1970s to protect forests from commercial logging.
Step 2: Place of origin.
It started in Chamoli district of Uttarakhand (then part of Uttar Pradesh) under leaders like Sunderlal Bahuguna, Chandi Prasad Bhatt, and Gaura Devi.
Step 3: Eliminate other states.
(B) Himachal Pradesh: Had forest movements but not Chipko.
(C) Madhya Pradesh: Wrong.
(D) Kerala: Known for Silent Valley movement, not Chipko.
Step 4: Conclusion.
Correct answer: (A) Uttarakhand.