I think it is Plain Folks. I'm not 100% on this but I do think it's plain folks.
Answer:
B. By reminding the country of its vow to protect Vietnam.
Explanation:
Because in each section, their is a constant add on that the USA vowed and promised to protect and help Vietnam.
and I just took the test anyways so...
A. Krumpers fought their way into the final competition.
Answer: To teach the lessons to children through fantasy to let them enjoy it
Explanation:
When I Read those books, it has the fantasy to make it interesting for me to continue reading and in the end, all the books will have different lessons that like don’t be greedy, mean, or other bad things and teaches you good thing instead