单项选择题

Passage 1
Questions 11 to 13 are based on the passage you’ve just heard.
[听力原文]11-13
I had a working mother when I was a young girl. She went back to work when I was ten and my brother was fourteen. She taught at a school of dress design. I studied English at university. Then I got a job with an advertising agency as an assistant. I studied English so I could get a good job with a good company. In 1980 I went abroad with a friend. We spent a month in California Then I worked for a company which sold cassette tapes and books for English conversation. I was still single at 25. then my parents started to worry because their daughter wasn’t married.
Our neighbors and relations were asking when I would marry and they began to talk about an arranged marriage. In Japan they don’t force you to marry someone, but they may give you a chance to meet someone. I am very interested in jazz and I met my husband in a jazz club. My parents didn’t want their daughter to marry a foreigner. They didn’t want me to come to England. but now I work in London for a Japenese newspaper.

When did her mother go back to work()

A.When she was only ten.
B.When she was only fourteen.
C.When her brother was only ten.
D.When she went to university.