C) blurry-boffo
Since there are over 170,000 words in the dictionary, searching for a specific word can be rather daunting. Dictionaries use guide words at the top of the page to help you find the correct page. When looking up the word boasted, if you only went to the B word section of the dictionary, it would still be incredibly tedious. When looking up a word, your word must be between the guide words in order for it to be on that page. All the words start with b so it's necessary to look at the second letter. O comes after L. In this case, we also need to look at the third letter. A comes before F so we know that boasted is between blurry and boffo.