If the mouse is too far but keyboard is correct in computer work, which strain may still occur?

Correct answer: Hand and shoulder strain

Direct answer: A, hand and shoulder strain. Ergonomics studies how the worker, equipment and work arrangement fit together. A mouse placed too far away makes the user repeatedly extend the arm, lift or reach the shoulder, and possibly bend the wrist. Even when the keyboard is at a suitable distance, the mouse position can independently create awkward posture and muscular effort. With long or repeated computer use, this extra reaching may cause discomfort or accumulated strain. Option A is correct because it names the body areas most directly affected by repeated reaching. B is not the best answer because the described problem is in the upper limb, not primarily the feet. C is a floor-safety issue and is unrelated to mouse reach. D describes room temperature, not a posture or equipment-placement problem. Memory cue: every frequently used tool should be close enough to use without stretching.