If pain reduced after ergonomic improvement but work errors increased, what needs to be checked?

Correct answer: Whether the new setup is affecting workflow and visual clarity

The direct answer is A: it is necessary to check whether the new arrangement is affecting workflow and visual clarity. Ergonomics is not successful merely because one symptom improves; it should support safety, comfort, accuracy, productivity and ease of use together. Step by step: first confirm that pain reduction is real; then observe the new posture, reach, sequence of tasks, visibility, lighting and control placement; compare error rates before and after; finally modify the design if needed. Option A is correct because poor workflow or unclear visual information can increase mistakes even when physical discomfort falls. Option B is wrong because reduced pain is a valuable positive result and should not be treated as false without evidence. Option C is wrong because stopping work immediately is not the only response; investigation and redesign are more appropriate unless there is immediate danger. Option D is wrong because wall colour is not the main issue described and changing it may not improve workflow or visibility. Memory cue: judge ergonomics by comfort plus accuracy, safety and performance.