At the beginning of the book, the Glass Castle is a symbol of the family's , but as Jeannette gets older, it becomes a symbol of her dad's broken promises.
The Glass Castle is the story of the author Jeannette Walls who describes her experience of the development from her childhood to the adulthood. It also includes the importance of the education.
The Glass Castle, which Dad promised to construct, served as both the family's hope and Jeannette's idol during much of her childhood.
However, as Jeannette gets older, the castle comes to stand for his failed promises. Thus the correct option is broken promises.
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