Go with a. I'm pretty sure it's already correct.
The ant is a hard worker who knows that in order to have a comfortable and happy lifestyle, one must work to obtain it, instead of squander time with play.
The grasshopper is a character who only cared about playing and having fun, and so when the time came (winter) when he truly wanted to be inside and comfortable, there was no food and shelter to sustain him. He did not understand the greater value of working hard for comfort.
Answer:
The main change he goes through is finding his identity in the shadow of his older brother, Erik. He also finds the courage to confront Erik at the end of the novel, which no one else in his life has been able to do. Paul is dealing with a move from Houston, Texas to Florida
