Yoga asanas can be broadly grouped by what they are designed to do: some calm the nervous system and aid relaxation, some improve flexibility or digestion, and a smaller group actively strengthens muscle and burns energy. Sorting the four options into these groups points directly at the answer.
Since three of the four options belong to the relaxation or digestion group and only one genuinely demands active core and back engagement, that one stands out as the pose associated with reducing obesity.
Therefore, the correct answer is Shalabhasana.

