You graduated from college two years ago and began working at Hampstead Electronics. You have received good performance evaluations and a raise. You just found out that your organization has hired a recent college graduate with no experience at a higher salary than you are now making. You consider this an unfair act and resolve to do something about it. Which of the following theories best describes such a situation?

a. equity theory
b. self-determination theory
c. goal-setting theory
d. two-factor theory
e. theory of needs