An organisation bought adjustable chairs but users do not know how to adjust them. Why will the benefit remain limited?

Correct answer: Because correct use training is also needed with equipment

Direct answer: A, because correct-use training is needed along with the equipment. An adjustable chair can support different body sizes only when the user knows how to set its height, back support, and other features. Without training, the chair may remain at an unsuitable setting, so the intended ergonomic benefit is not achieved. A is therefore correct because design and informed use must work together. B is wrong: adjustable chairs are not always bad; their value depends on quality and use. C is wrong because colour has little bearing on posture or adjustment. D is wrong because seated work is possible and common when properly arranged. Training should explain adjustment, posture, and warning signs. Memory cue: good design plus correct use equals real ergonomic benefit.