What does an en dash primarily indicate?

The en dash is primarily used to indicate a range in numbers, dates, or other sequences. It is often employed to show the span from one number or date to another, such as "The event will take place from 10:00 a.m. to 1:00 p.m." In this context, the en dash effectively communicates continuity or a connection between the starting and ending points of the range.

While other punctuation marks might be used for different purposes, such as the hyphen for connecting words or the em dash for a pause in thought, the en dash specifically serves to clarify that two items are part of a continuum, enhancing clarity and comprehension for the reader. Therefore, its primary function is indeed to show a range, which is why this choice is correct.