Final answer:
According to the equity theory, Bella is likely to reduce her effort, change perceptions of Sandy's inputs, or increase her own inputs but is not likely to increase her outcomes as they are typically out of her control.
Step-by-step explanation:
According to the equity theory of motivation, there are various ways Bella might respond to the perceived inequity between what she earns compared to Sandy for similar work. She might reduce her own effort because she feels undercompensated, or she could change her perceptions of Sandy's inputs, rationalizing that Sandy might contribute more in ways she hadn't considered. Bella might also seek to increase her own inputs, trying to make her work more valuable. However, one response that Bella would not take according to equity theory to correct the inequity is to increase her outcomes, as this typically refers to outcomes like pay, which are controlled by the employer rather than the employee herself.