Which of the following incurs a deduction for insufficient height on the beam?

The correct deduction for insufficient height on the beam is up to 0.20. This deduction applies when a gymnast demonstrates a lack of necessary height in elements such as jumps or leaps, which is crucial for both aesthetic quality and difficulty in their routine. Height enhances the visual impact of the performance, and insufficient height can detract from the execution and overall evaluation by judges.

Deductions are intended to reflect the degree to which a gymnast fails to meet the set standards for skill execution. In this case, a deduction of up to 0.20 is appropriate because it signifies a noticeable yet not extreme lack of height that impacts the quality of the performance. It maintains a balance between holding gymnasts accountable for their performance while still recognizing the overall integrity of their routine.