Please answer the following question: Read the following article and select the best answer. Article: When a dirty and untidy grey cat showed up in the prison yard, I was one of the first to go out there and pet it. I hadn't touched a cat or a dog in over 20 years. I spent at least 20 minutes, knelt down behind the kitchen as the cat rolled around, relaxed. When he was expressing outwardly, I was feeling inwardly. It was an amazing bit of grace to feel him under my hand and note that I was reaching a life or another creature with something as simple as my care. Over the next few days, there were other prisoners responding to the cat. Every yard period, a group of prisoners gathered there. They stood around talking and taking turns petting the cat. These were guys you wouldn't usually find talking to each other. Several times I saw an officer in the group, not chasing people away, but just watching and seeming to enjoy along with the prisoners. Bowls of milk and water appeared along with bread, wisely placed under the edge of the dustbin to keep the birds from getting it. The cat was obviously homeless and in pretty bad shape. People said that the cat came to the right place. He's getting treated like a king. This was true, but as I watched I was also thinking about what the cat was doing for us. There was a lot of talk about what's wrong with prisons in America. We need more programs. We need more psychologists or treatment of various kinds. Some may even talk about making prisons more kind. But I think what we really need is a chance to practice our own kindness. Not receive it, but give it. After more than two decades here, I know kindness is not a value that's encouraged. It's often thought of as a weakness. Instead, the culture encourages keeping your head down, minding your own business, and never letting yourself be weak. The cat did my heart good to see the effect he had on me and the men here. By simply saying, "I need some help here", he did something important for us. He needed us. And we needed to be needed. I believe we all do. Question: From the passage we can learn that the author was_. - an animal protector - the owner of the cat - a prison officer - a prisoner
Answer:
a prisoner