People Aren't Good at Predicting How Happy They Will Be

Multiple Choice

People aren't good at predicting how happy they will be in the future. Why is this

A) People overestimate their emotional reactions to specific events.
B) As people's lives change, their bases for social comparisons change accordingly.
C) Despite the impact of specific events on people's lives, much of life remains the same as time goes by.
D) all of these