Answer: C. A student slips on the ice in front of school and sprains his ankle.
Explanation: Unintentional means on accident or not meaning to happen. It isn't answer A since then man intentionally assaults the woman. It can't be B because the fighting is thought through and the hitting is also intentional. And it cannot be D because when someone decides to cut them self it is an intentional act. That leaves C. Because if a student slips on some ice...I don't think they would do it intentionally.
Answer: most likely if you let him out in the streets with out a leash he could be learning too many f i g h t i n g ways and he thinks that the sulution to a problem. A good way for him to start listen again start by giving treats when he does listen and he will know.