阅读下面短文，从短文后各题所给四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
The story of the red-crowned crane
Have you ever heard of the song "The story of the red-crowned crane"? It is about a girl called Xu Xiujuan.
Xu xiujuan was born in Zhalong, Heilongjiang Province in 1964.Her father's job was to look after red-crowned cranes. Xiujuan started helping her father when she was young. She soon showed a great love for these white birds. She become good at raising them.
When Xu Xiujuan was 21, she got a job at a nature reserve in Jiangsu Province . She enjoyed taking care of the baby cranes. If a bird become sick, she took good care of it stayed with it every day until it was strong enough to fly again.
In September 1986, one of the birds went missing .The workers in the nature reserve looked everywhere, but no one could find it. Xiujuan was very worried. She looked for it day and night for two days. On the second night, while she was looking for the missing bird, she fell into a river and died. She was only 23.
Later, a song was written in memory of Xiujuan. Though Xiujuan died young, people always remember her when they hear the song or see a red-crowned crane.
