Final answer:
The level of stress that achieves the highest amount of performance is the optimal level of stress.
Step-by-step explanation:
The level of stress that achieves the highest amount of performance is the optimal level of stress. As stress increases, performance also increases until it reaches this optimal level. At this point, a person feels fully energized, focused, and can work with minimal effort and maximum efficiency. However, if stress exceeds this optimal level, it becomes excessive and debilitating, causing burnout and a decline in performance.