During Change of Shift Report, the Nurse Hears That a Patient

During change of shift report, the nurse hears that a patient is experiencing hallucinations. Which is an example of a hallucination?

A) Man believes that his dead wife is talking to him.
B) Woman hears the doorbell ring and goes to answer it, but no one is there.
C) Child sees a man standing in his closet. When the lights are turned on, it is only a dry cleaning bag.
D) Man believes that the dog has curled up on the bed, but when he gets closer he sees that it is a blanket.