Final answer:
The graph representing the relationship between arousal and performance as described by the Yerkes-Dodson law is a hyperbolic graph with a peak at the optimal level of arousal, showing that both very low and very high arousal can impair performance.
Step-by-step explanation:
The Yerkes-Dodson law indicates that there is an optimal level of arousal for peak performance; this level varies depending on task complexity. The graph that best represents the relationship between arousal and performance would ideally demonstrate this optimal peak. Therefore, the correct answer is a hyperbolic graph with a peak indicating an optimal level of arousal (option B). This shape captures the idea that both low and high levels of arousal can impair performance, with moderate arousal typically yielding the best results. This is crucial for understanding phenomena such as why a softball team may perform poorly due to inadequately low arousal before an anticipated easy match.