英语阅读题!“Be proud of what you do”, my father always told me, “

英语阅读题!
“Be proud of what you do”, my father always told me, “whether you are a boss or a cleaner”, When I was 15,I got a summer job in a hospital, I was told that my duties would include sweeping floors. I smiled and remembered Dad’s words.
Even though my job was the lowest,it made me feel excited. I saw it as a challenge because it was my first job. I learned to be on time and tried to do everything well. In return(作为回报),I was treated with respect by doctors, nurses and patients. Each morning I imagined that the dirty dishes would make patients more sick if I were not there to wash them clean. After breakfast was done, I started sweeping the floors of all patient rooms and cleaning toilets. Though I was tired, I wanted the job to be done well, people would say, “that young boy really does a good job, “That gave me a pride
Working in the hospital taught me that being proud of one’s job is important. It does not matter whether the job is sweeping floors or managing a large business, though every job I have ever had my father’s words have always stayed with me, I have swept floors, and I have been a manager, I think Dad would be proud of me!
question：which is the best title of the passage?
A.smiling with yourself
B.my father
C.my first job
D.working in the hospital
请回答!

C,全篇文章都是在讲工作的事情