What Is the Underlying Thesis of the Effort-Reward Imbalance Model

What is the underlying thesis of the effort-reward imbalance model of stress propose?

A) Having control over rewards leads to more effort and less psychological distress .
B) Psychological distress occurs when rewards are inadequate for the effort expended.
C) Psychological distress occurs when the effort to cope with demands devalues the rewards of work.
D) Psychological distress occurs when rewards are given on a variable, non-contingent schedule.