D- Shelly started a dialogue with her coworkers about how to handle the problems the company was facing.
In this sentence dialogue is used correctly. A dialogue is a conversation with another person or group of people, or using words with another person or group of people.
A prologue is an introduction to a work. It usually entices the reader or gives the reader knowledge that will help him/her better understand the work.
Option A is wrong because dialogue should be prologue since the information about her inspiration comes before the book. Option B should have dialogue instead of prologue because the characters are talking to each other. Option C should also be dialogue instead of prologue because the people are debating, or talking to each other.