D He performs badly, compared to Algernon
C. Themes are universal ideas found in literacy works. A theme can be a lesson or a piece of advice non specific to the characters in the story.
I believe it's B. It seems to be the only one that is very blunt and uses a different tone from the other sentences.
She could argue that you don't need to sell the same thing every year and therefore, we could all try something different this year, not just candy.
She also could argue that candies are not healthy and it's time to distance ourselves from them for now.
The best argument that she could pull off would be, if that was really the case, if fruits were easier and more profitable to sell. By far, if that was the argument, they would all sell fruit easily.