Final answer:
The title of a book, film, or play requires the use of italics as per MLA style guidelines.
Step-by-step explanation:
The question at hand relates to the usage of italics in written English, specifically in referencing different types of works.
According to the MLA style, which provides guidelines for formatting text and citations in humanities papers, you should use italics for titles of long works.
These long works include items like books, plays, films, and other standalone works that are published or produced separately. For example:
Title of Book.
Play Title: Subtitle.
Film Title.
Therefore, out of the options presented, b. The title of a book, film, or play requires italics.