Hi!
The answer would be D, because it is introducing the main idea of Edison and Electricity.
Hope this helps!
I believe the answer is A. Favorite.
Http://www.citationmachine.net/
Best citation website ever. East to use. If you don't have an author you use the next required filed of information.
Expository writing is when an author is trying to present information or an idea for the purpose of explaining or informing. Examples includes reports, essays or news articles.
