She forces them to wonder and keep reading to find out why Sylvia feels the way that she does. The audience can understand Sylvia's anger and frustration, when in society everyone is not given the same opportunities and chances for success and happiness. Bambara appropriately uses anger in this work. This emotion forces Sylvia to reach down within herself. She wants to go above and beyond her means.
Anger is an incredibly powerful emotion.
Authors use anger as a source to capture their audience's attention. Not always do writers achieve the goal of their work, but Bambara is able to accomplish her goal. Bambara uses this emotion, not only to interest her audience, but to force them to feel what Sylvia feels.