Research on the Relationship Between Physiological Arousal and Performance Has

Research on the relationship between physiological arousal and performance has determined that:

A) the optimal level of arousal for performance varies with task complexity.
B) as arousal increases, performance increases to a point, but after that, further arousal serves to decrease performance.
C) as arousal increases, performance always tends to decrease.
D) as arousal increases, performance always tends to increase.
E) both as arousal increases, performance increases to a point, but after that, further arousal serves to decrease performance AND the optimal level of arousal for performance varies with task complexity.