The correct answer is D. Infantryman/infinitive
Explanation:
In dictionaries, the term "guidewords" refer to two or more words that are printed at the top of each page in a dictionary and that work as a guide for the reader to know the words that each page contains. In this way, the first word printed at the top of the page in a dictionary shows the reader the first word that appears on the page and the last word tells the reader the last word that he or she would find in that page, this is used because dictionaries organize words alphabetically and therefore by looking at guidewords it is possible to find a word faster. Considering this, in the case of the word "infer", this word can be found if the guidewords "Infantryman/infinitive" appear as this shows words that are alphabetically between "infantryman" and "infinitive" such as infection, infelicity or infer are included in that page.
