If the screen is in front but the chair is turned sideways, what ergonomic problem may occur?

Correct answer: Twisted sitting posture and back strain

Direct answer: A, twisted sitting posture and back strain. Good computer ergonomics requires the chair and the worker’s trunk to face the screen so that the head, neck and spine can remain near a comfortable alignment. If the chair is turned sideways, the person may repeatedly rotate the neck, shoulders or trunk to look forward. Holding or repeating this twisted position can create muscular fatigue and discomfort, especially in the back and neck. A is correct because it identifies the likely postural problem caused by the mismatch between chair direction and screen position. B is wrong: a sideways chair does not improve screen use. C is the opposite of the likely effect and is unsupported. D is wrong because the misalignment is a real ergonomic risk even if pain has not appeared yet. Memory cue: align the chair, body and screen in one forward direction.