What effect can ergonomics have on a worker's productivity?

Correct answer: It can increase it

The direct answer is D: ergonomics can increase productivity. Ergonomics means designing the workplace, tools, posture, and work method according to the worker's body and needs. When a chair, table, tool, or working height is suitable, the worker can work more comfortably and safely. Comfort reduces unnecessary tiredness, pain, and mistakes. The worker can then maintain attention and complete useful work more efficiently, so productivity may increase. Option D is correct because good ergonomic design supports better performance. Option A is wrong because ergonomics is not intended to always reduce productivity; it generally aims to improve safety, comfort, and efficiency. Option B is wrong because fatigue, posture, tools, and workplace design clearly affect work performance. Option C is wrong because ergonomics does not stop work; it helps work continue safely. Remember: a suitable workplace helps the worker work better, not merely harder.