Answer:
The equity theory
Step-by-step explanation:
Equity theory which was bring to light in the 1960s, focus on the fair balance between benefit people derive or employee output and their contribution or employee input accordingly. This theory is usually referred to as Adams' Equity Theory. It calls for fair reward in exchange to an input.
Therefore, the right statement is "According to The equity theory, how much people are willing to contribute to an organization depends on their assessment of the fairness of the rewards they will receive in exchange".