Answer the following question: Write a multi-choice question for the following article: Article: What's your favorite cartoon? It may be difficult for you to decide. But for pianist Lang Lang, Tom and Jerry is the best one. When Lang was two years old, he saw Tom play the piano. This was his first time to enjoy western music and this experience encouraged him to learn to play the piano. His talent at the keyboard has taken him from Shenyang to the world. Lang became a good piano student at three. Ever since, the boy has been doing better and better. In 1997, the 15-year-old boy studied at a famous American music college. Lang's performances are energetic. He is well-known for making facial expressions and moving around while playing the piano. The road to success has never been easy. Lang's father stopped his job to look after him, while his mother stayed in Shenyang to make money. But Lang thinks himself lucky and believes he should give something back. He has helped the children in poor areas a lot.
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Question: Why did Langlang's mother stay in Shenyang?Options:A Because she liked Shenyang, she didn't want to leave.B Because she had to look after Langlang's grandparents.C Because she had to make money to pay for Langlang's education.D Because she didn't love her son.Answer:C