What is the ergonomic reason for avoiding shelves at wrong height in the workplace?

Correct answer: To reduce unsafe reach and body strain

The direct answer is D: reduce unsafe reach and body strain. A shelf at an unsuitable height may force a worker to bend too far, stretch above shoulder level, twist the body, or use a stool. These actions can reduce balance, make objects fall, and place extra load on the back, shoulders, neck, or arms. Ergonomic shelf placement keeps commonly used items within a safe and comfortable reach. Option D is correct because it explains both safety and body comfort. Option A is wrong because the purpose is not to hide files. Option B is wrong because shelf height is not selected to change colour. Option C is wrong because good design supports continued work rather than stopping it. Remember: store frequently used objects between comfortable waist and shoulder reach whenever possible.