Answer: c. unrealistic performance goals
Step-by-step explanation:
From the question, we are informed that Bethany works for FastFashion Inc. which has set the same sales target for all employees in their 550 stores across the globe and that the company fails to take into account any environmental constraints which might hamper sales and to avoid being penalized, employees often falsify their sales reports.
Based on the scenario above, the issue triggering the employees' unethical behavior is unrealistic performance goals. Since the employees don't meet their target, they falsify their sales report.