My best bet would to go with 'were' because they sound similar and it just seems more professional.
From my my experience this usually differs depending on the type of book it is, but I think the best choice is either A, to help the reader understand new concepts, or C., It allows the reader to focus on key ideas and information during the reading. I'd pick C though, since it's more in depth and makes more sense.
B. doesn't make that much sense unless the book is an argumentative or a persuasive book.
D. only applies to personal narratives. Nobody can understand a writer's personal experiences and attitudes otherwise.
Answer:
D:people adore the Impressionism art movement
Answer:
First you have to have a hook like, Have u ever been on Vacation. then you have to list the 3 things your going to talk about. That's really all an introduction is.
It would be #1, since personal experiences are usually irrelevant in those formats. Hope this helps. :)
