Which of the following can be used to manage breaks between lines or sentences in a document?

The option that addresses managing breaks specifically between lines or sentences in a document is a line break. A line break is a formatting feature that allows the text following the break to start on a new line without starting a new paragraph. It effectively breaks the line while keeping the two lines within the same paragraph, which is a common practice in poetry or certain text formats where you want to control how text flows.

This formatting is distinct from other types of breaks. A page break, for example, is used to start a new page, while a section break alters the layout of a portion of the document for formatting purposes, such as changing the number of columns or headers. A hard return, often referred to simply as a return, creates a new paragraph, which would introduce additional space between the text blocks, again differing from the continuous flow desired with a line break. Therefore, the line break is the most suitable choice for managing breaks specifically between lines or sentences.