Which of the Following Actions Is an Acceptable Reason for Dismissing

Which of the following actions is an acceptable reason for dismissing Anna Black?

A) Anna has blown the whistle on an employee who was sexual harassing his secretary.
B) Anna has demanded that her employer take certain precautions to prevent employees from getting sick building syndrome.
C) Anna filed a workers' compensation claim as a result of injuries she sustained when a file cabinet fell on her.
D) Anna has a history of being late for work at least two mornings a week.
E) Anna asked union organizers to come to her company and start a union.