The answer would be, C: repetition of the first stanza
The correct answer is "customs"
Not only does it focus on customs, but also on conversations between the characters and their behavior, as well as their thinking and social status.
Answer:
1. My friend's backpack is filled with lots of books.
2. The Johnsons' dog needs a bath and his nails trimmed.
3. Apples are on sale this week. Next week bananas will be discounted at many groceries.
4. Won't you please join us for tennis even though you don't have a racket? You can borrow ours.
5. The rhinos at the zoo are exciting, but the fishes are even more fun to watch.
6. The girls' performance showed that they were very talented.
7. The James' house is bigger than yours.
8. Put on your hats and gloves before you go outside.
9. You shouldn't put off your homework until the final hours of the day.
10. The days are long but the years are short.
Well, the whole novel is basically told through these letters, so they are used to advance the plot an offer some sense of authenticity to an implausible story. Plus, it is a way for them to express their own feelings and thoughts about the whole thing.
