The role that suspense plays in the story's effect is "It introduces a series of sub-plots that keep readers guessing about the end," as stated in option D.
We say an author has created suspense when he or she is able to introduce elements or information that leaves readers curious about what happens next in the story. In other words, readers are kept guessing, wanting to know more.
With the information above in mind, we can select option D as the correct answer. The suspense in "Daring the Duomo" introduces a series of sub-plots that keep readers guessing about the end.
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