Cory and Hayden often compare themselves to one another. Both occupy comparable positions in the organization and have been with the company for the same number of years. Cory has an MBA and Hayden has a bachelor's degree. Cory works through lunches most days, and Hayden goes to lunch every day and returns late most days. Cory's performance is at a higher level than that of Hayden. Yet Cory believes that Hayden makes more money and feels underpaid relative to Hayden. What motivation theory is Cory relying on? A. Goal-setting theory B. Equity theory C. Two-factor theory D. Learned needs theory E. Expectancy theory