According to the Yerkes-Dodson law, how does arousal relate to performance, and how does task complexity affect the optimal level?

• A. Arousal has no effect on performance.
• B. Performance declines as arousal increases.
• C. Performance improves with arousal up to an optimal point, and beyond that performance declines.
• D. Performance improves with arousal up to an optimal point, after which it declines, and the position of that optimum depends on task complexity.

Answer: (D)