dia- = "with"log = "word"pro- = "before"

“Dialogue” combines dia- (“with”) and log (“word”), and it means a conversation or exchange of words. Shelly starts a conversation with her coworkers, so choice D uses “dialogue” correctly. A dialogue is not simply an explanation written at the beginning of a book, and a prologue is an introductory section that comes before the main work—not a conversation between characters or a heated book-club debate.

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