Answer:
Harry is destined to destroy Voldemort. Harry, Ron, and Hermione go looking for horcruxes. Tonks, Lupin, and Fred die. Voldemort duals Harry and Harry wins.
Explanation:
I read the book.
The correct answer is A. You can receive instant feedback from your audience.
This is something that cannot be done if you are writing a text and your audience reads it at their home - they cannot immediately let you know what they think about your ideas and arguments. However, if you are giving a speech in front of an audience, then they absolutely can. B, C, and D are examples of what happens during writing, rather than speaking.