Answer A. details.
The most obvious difference between a complete piece of writing and an outline is the details. An outline is just the summary of the content i.e., the summary of the article, or the speech. Whereas, a finished piece of article can be said to contain all necessary and important information for the article to be said to be complete.
The outline is a summary of the finished articles.it is shorter and just the key points are included in an outline however, in the finished article, all necessary details are included