Answer:
two-factor theory
Explanation:
Two-factor theory: In psychology, The term "two-factor theory" was proposed by Frederick Herzberg during 1959, and is also denoted to as "Herzberg's Motivation Theory model".
The "two-factor theory" tends to provide two distinct factors that are responsible for affecting motivation in a particular workplace including motivating factors and hygiene factors.
Hygiene factors affect employees to work less.
Motivating factors encourages employees to work hard.
In the question above, the different emotions experienced by Harley can best be explained by the two-factor theory.