Read the following passage and choose the correct answer (A, B, or C).

Once upon a time, there was girl called Cinderella who did all the work in the kitchen while her lazy sisters did nothing. One night her sisters went to a ball at the palace. Cinderella was left at home, feeling very sad. After a time her fairy godmother appeared and told Cinderella that she could go to the ball, but she had to return home by midnight. So she went to the ball in a beautiful dress and a wonderful coach. She danced with the prince, but at midnight she ran back home, leaving one of her shoes on the dance floor. They price wanted to see her again and went to every house in the capital until he found that the shoe was the right size for Cinderella. The prince and Cinderella were married and lived happily ever after.

What did Cinderella do at the ball?