The word that most clearly describes a medium? is:
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A medium is any thing that is used to convey an information or pass across an idea.
An audiobook is any book that is used to narrate the events that occured in a book.
According to the given options, we can see that an audiobook is the only option that is a medium because it is a means that an author or speaker can talk to his listeners about a book.
As a result of this, the other options are not correct because they are not a medium.
Therefore, the correct answer is option D
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