Ellipses (...) in a document typically indicate that words or sentences have been omitted. This is often used in quotations or excerpts to indicate that parts of the original text have been removed for brevity or clarity. So, the correct answer from your options would be:
Words or sentences have been omitted.
However, it's worth noting that ellipses can also be used in other contexts, such as indicating a pause in speech or an incomplete thought.