Answer:
B) Acme Corporation may defend that it did not know about Tom's harassment of Tina
Explanation:
In this scenario where the two co-workers clean the office at night when the building was empty, Tina has never complained about Tom's misconduct to her supervisor. Also the supervisor does not work nights with Tom and Tina, she works in the morning.
Acme Corporation will use this a defence if sexual harassment charges are filed. The supervisor was not told of the sexual harassment and neither was she on the same shift with the workers. So the employer was not aware of what was happening.
Since the act was only known to her co-worker Tom it will be a case between her and Tom and not her employer (Acme Corporation).