Which of the following describes the use of an en-dash in a document?

The use of an en-dash is primarily to link two related items, often indicating a range or connection between them. This could manifest in various contexts, such as expressing a range of dates (e.g., "1970–2020") or linking two items that have a relationship (e.g., "the New York–London flight schedule").

While the other choices refer to different typographical marks or punctuation that function to create breaks or pauses in text, they do not capture the specific purpose of the en-dash. The en-dash is distinct from the hyphen, which connects words, and the em-dash, which indicates breaks or abrupt changes in thought. Understanding the precise role of the en-dash in establishing connections or ranges enhances clarity in written communication, making it an essential aspect of accessible and effective document design.