I would say B because Carpal tunnel syndrome is caused by repetitive flexing and extending of tendons (it gets worse if it's for a long time) pressure on the median nerve can cause pain numbness and weakness in the hand and wrist. So this is the best answer as it shows there is a poor working environment it would be better if there was something as simple as a mouse pad that the wrist could lay on while using the mouse for example or using padding on the desk could improve the working environment and prevent this.
