Given the question: When I was six, my mother placed me in a boarding home. For the next nine years, I never slept in a room that contained less than 30 other kids in it. So, when I was promoted to senior at the high school for my final year there, I had the greatest pleasure of rooming with just one other classmate, and the added feature of a semi-private bathroom. We seniors also had the feature of walking around the campus in special hats, we called senior bonnets. So all the other kids would know we were the highest in the high school. As seniors, we frequently went on field trips outside the campus, including city museums, city hall, colleges and theatres. The highlight was a senior class trip to Washington, D.C., where we sat in on a session of Congress, visited the monument and many other government sites around the city. Another benefit of being seniors was that many of us on athletic and other extra-curricular teams were elected to high ranking for the year. I had the honor and pleasure of being chosen captain of our state championship swim team, while my roommate was voted president of the drama club. Graduation services were on a sunny day in June. Each of us had looked forward to this moment for ten years. Now we were going out on our own to complete freedom, and we should have been flooded with joy. However, to my surprise, I found myself crying, something I hadn't done for years. I noticed many of my classmates usually proud of their macho guy  attitudes, were also wiping away tears. We knew we would never be together again as we were on that graduation day. Our senior year ended with deep feelings of sadness for our loss, as well as joy for our emerging into a new world beyond the school campus. The author and his classmates can't help crying at graduation services as  _  . A) their parents had marriage problems and were faced with divorce then B) they were not admitted to their dreaming universities C) he would say goodbye to his school and he would face new challenges D) the headmaster gave a moving speech at the meeting
The answer is:
C