One Way to Determine Whether Emotions Help People Thrive Psychologically

One way to determine whether emotions help people thrive psychologically and socially is to study cases where emotions and emotional development are atypical. Which of the following is not an approach used by scientists to determine whether emotions are functional?

A) Study people whose emotion responses have been changed by brain lesions
B) Study people whose emotion recognition abilities have been disrupted by developmental disorders
C) Study the genetic correlates of emotions and see whether other successful species have them. If not, they are likely not functional
D) Study the relationship between one's ability to express and discuss emotions and overall psychological health