According to people will be motivated at work when they perceive that they are being treated fairly.

The answer to this question is equity theory. The equity theory is a theory that was developed by the behavioral psychologist John Stacey Adams. An equity theory of motivation focuses on the idea that the people / employees are being motivated because of the fairness that was being set to them by the company and if the employees receive an unfair treatment they are being demoralized and un-motivated to do well in their jobs / tasks. 

the right answer is a

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