Employee A notices that Employee B receives the same amount of rewards from management as he does, even though Employee B seems to put significantly less effort into his work than Employee A does. Having observed this, Employee A is frustrated and decides to "even the scales" by reducing the amount of effort he puts into his own work. Employee A's reaction is consistent with the predictions of which motivation theory? Question 15 options: Job characteristics model Maslow's hierarchy of needs Equity theory Expectancy theory