The answer to this should be D because with a computer file you can either save it or print it out usually a computer file contains a document which is printable.
So I believe the answer is D.
Hope this helped :)
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The Geats passed by the guard at the shore. He called out a greeting to them as they loaded their treasure aboard the ship. Beowulf gave a jeweled sword to the man who guarded the boat. This gift earned the man much respect in the beer hall.
It would have to be: Make sure that you have clearly explained what happened, how it happened, and why.
to better explain some of the ideas in the main text is your answer.