听力原文： After retiring from 30 years of teaching, I could easily have decided to sit back and relax and enjoy a peaceful retirement. But that kind of life is not for me. I just wanted to do something different. If you are going to participate in life, do it. Don't just sit down and look out of the window. At 68, I decided to become one of the pioneer participants in a program at the University of California. The program offers campus housing and classes to people over sixty. I enrolled in a class called Human Relationships and Diverse Society. I taught my minority students in my English and drama classes in high school for 20 years. But in this course, I found out a lot about other cultures I didn't know then. One of the most important lessons that I'm learning is to perceive (感知,理解), not to judge. Older adults can add to the educational resources of the university by bringing with them a lot of valuable experience. Their presence on campus helps break some long held beliefs about aging. Young students may have fears of growing older. But that kind of fear can be reduced as they see that older people can be active, healthy, and continue to contribute to society. The younger students can begin to see aging as a natural part of living.
What did the speaker do when she was 68？

A. She sat back and relaxed.
B. She decided to retire.
C. She entered university.
D. She worked out a new English program.