Cinderella lives with her stepsisters and their mother. They make her wear rags and do all the hard work.
An invitation to the ball arrives. Cinderella is force to stay at home since she has no dress to wear, while her stepmother and stepsisters attended the ball. A fairy Godmother appears and helps Cinderella go to the ball. The clock nearly strikes twelve and Cinderella runs away leaving her glass slipper behind.
The prince says he will marry the woman whom the slipper fits. The stepsisters try to force their feet into the slipper. The slipper fits Cinderella. Cinderella and the prince get married. They live happily ever after.
What element of the plot is being underlined?