Read the excerpt from the preface of a book. Which best explains why the author included this excerpt in the preface of the book? I wrote this book to describe events in the 1800s. I wanted to explore the time when settlers came to live west of the Mississippi River. You may know of people such as Daniel Boone, but there are other important figures. European explorers and conquistadors also played important roles in creating what became the United States. O to let the reader know the reason for writing the book O to mention sources utilized during the writing of the book O to thank the settlers who influenced westward expansion O to indicate a personal connection with the main topic of the book