Answer:
Your right?
Step-by-step explanation:
its the only answer that actually qualifies. Although any number above 20 would work I guess. there are no requirements.
I guess 21, its only one that makes sense to me.
21 is over 20, and you can sell no less than 20, all other answers are below 20, so the only one that makes sense is 21.
Hope i helped :)
