The odd one out is C. Think.
The other options are all physical activities that can be done by humans. Thinking is not a physical activity, but a mental activity.
Run: to move at a speed faster than a walk, never having both or all the feet on the ground at the same time.
Walk: to move at a slower pace than a run, with both or all the feet on the ground at the same time.
Jump: to push oneself off the ground with one's feet and move through the air for a short time.
Swim: to move through water using the arms and legs.