A psychologist who has studied emotions with Paul Ekman for decades is going to present a summary of the research. Which title might this psychologist consider?

a) "Emotion as a Deviation"
b) "Emotion: Evolution's Big Mistake"
c) "Why Emotions Are Not Fully Developed in Humans"
d) "How Facial Expressions Communicate Emotions"

. d Explanation: How facial expressions communicate emotions was the main topic of
Ekman's research.