Step 1: Person and cause.
Sunderlal Bahuguna was a Gandhian environmentalist from Garhwal who campaigned for forest conservation and sustainable development in the Himalayas.
Step 2: Movement link.
He became the most recognized face of the {Chipko} movement—non-violent resistance where villagers hugged trees to prevent commercial felling.
Step 3: Distinguish from other movements.
Narmada Bachao Andolan is associated with Medha Patkar; ``Dalit'' and ``Women'' movements are broad social categories, not his primary association.
Step 4: Conclude.
\[
\boxed{\text{Chipko Movement (Option C).}}
\]