Option D. An oral report should have a statement of the author's purpose.
Explanation:
An oral report may be given in an informal way, or in a formal way, it can be given to a few listeners in a small room or to hundreds of people in an auditorium. When designing and writing an oral report, the writer should always include a statement of the author's purpose. The oral report's structure consists on an introduction, where the author's purpose should be included and the topic that will be discussed should be introduced, the main body where the main discussion occurs, and the conclusion.
