Answer:
The correct answer is letter "B": a duty to discover and remove the hazard.
Explanation:
According to the hierarchy of Hazard Control, there are five (5) layers on determining the actions that should be taken in front of a dangerous situation. Those layers include protecting workers with Personal Protection Equipment (PPE), changing employees' methods of working implementing administrative controls or engineering controls, substituting the hazardous element, or completely eliminate.
Thus, the elimination or removal of the hazardous element after discovering it is the most effective measure to take to avoid any damages to other individuals, employees or not.