Which sentence uses dashes correctly?

What is a glossary? a statement of the author’s purpose in writing the book, which may include suggestions for using the book a page at the front of a book that lists units and chapters with their page numbers an alphabetical list of the specialized words and terms used in the book and their definitions an alphabetical list of all topics covered in the book and the pages on which they can be found

Solve this analogy problem: thick : thin : : heavy : question 1 options: gray round rosy light

Which best expresses the irony present in this passage?