Answer:
C. interest level
Step-by-step explanation:
It is not "potential", because she never performed shakespeare or ever really learned it. It isn't "disinterest" because she be wouldn't be motivated if she wasn't interested. It isn't "ability" for the same reason it isn't "potential".
The answer to this question is "interest level" because when she saw the Shakespeare festival and saw the production she became more interested in it the subject because she enjoyed the experience.
hope this is helpful!