Final answer:
In titles, prepositions that are four or more letters and emphasized may be capitalized.
Step-by-step explanation:
In titles, prepositions that are four or more letters and emphasized may be capitalized. This rule applies to titles of books, articles, plays, poems, films, and other works. However, it's important to note that the specific rules for capitalization may vary depending on the documentation style being used, such as MLA style. For example, the title of a book could be 'The Effects of Climate Change On Global Agriculture.' In this case, the preposition 'On' is capitalized because it is four letters or more and is emphasized. Overall, when considering capitalization in titles, it is important to consult the specific style guide or resource being used to ensure accurate and consistent formatting.