3. The Yerkes-Dodson Law predicts that most people perform best at a moderate level of arousal. Dr. Wills conducts a study to examine the relationship between arousal and performance. She has 300 participants come to her lab and perform a task while she measures both their arousal and their performance levels. Dr. Wills is conducting what type of research?

a. True experiment

b. Correlational

c. Case study

d. Naturalistic observation