Which statement BEST explains how Madame Loisel changes over time?

a) She is a beautiful, young woman who becomes a haggard old woman.
b) She is a spoiled young woman who becomes a devoted and loving wife.
c) She is a positive, upbeat young woman who turns into a sad, depressed old woman.
d) She is a selfish, frivolous, young woman who becomes an honorable, hard-working woman.