An element of a plot which is bolded in the fable above is C. climax.
A climax is the stage of action which often takes a turning point and results in excitement and change for the main character.
In the above short story, The lion is amused by the mouse's courage to help him someday. As one reads the story, the reader also tends to not believe in the mouse that a small creature would be helpful to the lion someday. Eventually, climax arises when the lion is trapped in a net and mouse arrives for his rescue. Interestingly, the one who was mocked has helped the lion in rescue. Therefore, such action creates excitement among the readers as to what will happen next? would they be friends?