a. first person since first person is through the author's point of view
Adding -s is the most common. for example: books, cups, pencils, etc. -es might have been the one that confused you, but that isn't a super common ending for plurals--instead, a more common one would be "-ies" which is when you drop the y (berry becomes berries, for example).
Hi. First, you have used the wrong spelling of, "which". A witch is a character ;)
Okay, back to your question. One example of a flashback in the story, "Borders" is when the mom talks about driving to Salt Lake City to visit her daughter.
If you read the story, you might find some other examples. Hope this helps.
Take care,
Diana
B. Novels have simple straightforward themes (and few of them).
