Answer:
B. You can simplify a document into objects that can be easily rearranged.
D. You can easily promote objects and create subheadings.
Step-by-step explanation:
By forming an outline for a document, you are basically trying to simplify it into objects that can be easily rearranged later. For example, you see a point written precisely and you can elaborate it yourself.
Also, the use of some objects and subheadings can help you go through the outline more quickly.