A fast way to identify an asana from an image is to first sort the options by basic body orientation, lying down, kneeling, or seated, since that alone eliminates most wrong choices before looking at finer details.
- Dhanurasana: This pose is done lying face-down on the stomach with the body arched upward, a body orientation that is completely different from a seated pose and easy to rule out if the image shows the practitioner upright or seated rather than lying prone.
- Uttan Mandukasana: This pose is done kneeling, with the hips resting back toward the heels and the knees spread apart, a distinctly different base position from sitting with crossed legs.
- Ardh Matsyendrasana: This pose is seated, which narrows things down further, but its defining feature is a rotation of the spine, the torso and shoulders turned to one side, rather than a forward fold.
- Yogmudra: This pose is also seated, typically in a cross-legged or lotus position, but its defining feature is the opposite of a twist, the torso folds straight forward with the wrists clasped behind the back, bringing the head down and forward rather than rotating sideways.
Ruling out the two poses with a completely different base position (lying down for Dhanurasana, kneeling for Uttan Mandukasana), and then separating the two remaining seated poses by whether the spine twists or folds forward, points to the seated, forward-folding posture.
Therefore, the correct answer is Yogmudra.