The correct answer is: A. 10 KM a day
The maximum distance covered by a patrol man should not normally exceed 10 KM a day. This is because the patrol man needs to be able to respond quickly to any incidents that may occur, and if they are too tired, they may not be able to do so effectively. Additionally, walking long distances can be physically demanding, and the patrol man needs to be able to maintain their health and fitness.
Option B is incorrect because it is too high. The patrol man needs to be able to respond quickly to any incidents that may occur, and if they are too tired, they may not be able to do so effectively.
Option C is incorrect because it is too high. The patrol man needs to be able to maintain their health and fitness, and walking long distances can be physically demanding.
Option D is incorrect because it is not a specific distance. The patrol man needs to be able to cover a distance that is appropriate for their fitness level and the type of work that they do.