The answer is b because the tone is almost as excitement and hints thing in the future
Here is a quote by Henry A. Wallace.
" It may be shocking to some people in this country to realize that, without meaning to do so, they hold views in common with Hitler when they preach discrimination against other religious, racial, or economic groups."
The idea discussed in both Tim O'Brien's "Ambush" and John Steinbeck's "Symptoms" is the after effects of the combat on the soldiers after a war is over. It talks about what the soldiers go through, their pain and their turmoil once they come back from having faced a war.
I would answer with the third option, as she does mention that she wouldn't place it in the dystopian genre, but there is no harsh criticism to suggest that she did not enjoy the book.
I hope this helps!