Final answer:
Lana fired Diane after discovering she had a criminal record for theft, indicating that Lana viewed this as grounds for termination.
Step-by-step explanation:
After learning about Diane's past, Lana made the decision to fire Diane. This course of action suggests that Lana took the information about Diane's criminal record seriously and believed it was a valid reason for termination. This situation reflects common dilemmas faced in the workplace regarding how to handle an employee's past criminal history and when it is deemed to affect the individual's current job performance or the company's reputation.