The correct answer is C.
The search term "retirement * makeover" will return results that include both the words "retirement" and "makeover" in any order. This is the best option for Leslie, as she is looking for a book that includes both of these words in the title.
The search term "retirement -makeover" will return results that include the word "retirement" but not the word "makeover." This is not a good option for Leslie, as she is looking for a book that includes both of these words in the title.
The search term "~retirement ~makeover" will return results that include the words "retirement" and "makeover" as well as synonyms for these words. This is not a good option for Leslie, as she is looking for a book that includes the specific words "retirement" and "makeover" in the title.
The search term "retirement makeover site: edu" will return results that include the words "retirement" and "makeover" and that are from educational websites. This is not a good option for Leslie, as she is looking for a book, not a website.