阅读理解阅读下面的短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项
Ever since I was a child, my mouth has caused me trouble．I'm not a had person．I have just had a hard time learning when to keep my mouth closed．My mum has told me again and again, "Robert, your constant had words are hurting me．If you continue to be this rude, you'll get into big trouble．"
It's been a problem at school several times when teachers have told me something I didn't want to hear．I used to feel it was my duty to stand up for myself and tell them off．
One day in English class I began working on my homework until I heard a classmate talking behind me．It was Nathaniel, talking to himself as usual．I said ever so nicely, "Nathaniel, would you be quiet'?" Nathaniel continued talking to himself．I quickly shouted "Nathaniel, shut up!"
For the next five minutes, we threw hurtful words back and forth at each other．
"At least I don't have an ugly lazy eye like you!" I shouted．I knew this would bother him deeply inside．It would hurt his feelings and shut him up．What I said filled him with anger．He tried to reach over my seat and grab me as he shouted, "That's it!That's it!"
Surprised at his reaction, I sat back in my seat．Never had I seen Nathaniel act like this before．
Later on, we were taken to principal's office．There, principal told us to discuss the matter．It wasn't until then that I finally found that when I hurt someone physically, the wounds eventually heal．But when I hurt them with my words, sometimes the pain never goes away．At the end of the discussion, I said sorry to Nathaniel．
When I headed hack to my room, I spent some time praying．I began to think about how often what I said hurt others．But I believe that as I keep praying and asking God to help me and he'll tell me when to keep my mouth closed．
