Step 1: Pose Identification
- Trikonasana (Triangle Pose): A standing pose involving wide leg stance and sideways bend to touch toes.
- Tadasana (Mountain Pose): A basic standing pose with arms raised overhead.
- Shalabhasana (Locust Pose): A prone pose performed lying on the stomach, lifting legs and chest. This is not a standing pose.
- Vrikshasana (Tree Pose): A standing balancing pose with one bent leg placed on the opposite thigh. Step 2: Determination of Non-Standing Pose
Shalabhasana is executed in a prone position, not a standing one, as it requires lifting the body off the ground while lying on the stomach.
\[
\boxed{\text{Correct Answer: (C) Shalabhasana}}
\]