The correct answer is C. A procedural document is one in which a procedure is described. A graph would be a good media element to add, since it is a visual aid that can clarify and illustrate the procedure being described in the document. Also, since documents are written texts, a graph can easily be added. The same is not true of options like adding music or an audience. Besides that, usually documents are written with a especific audience in mind. Bullet points could be added, but they would not contribute much to adding visual interest and clarity to the document. At least not as much as the graph