Answer:
I would say A.
Explanation:
The chance of getting no fives in 20 spins with 8 equal sectors is 1 in 160. The data is also slightly skewed left. All the other graphs are not skewed and have 1 or more outcome for each box. This indicates an unfair data-generating process for plot A.
I won't go into much depth of this analysis, but it should be enough to make you understand what is going on.
Hope this helps!