In Trying to Make a Differential Diagnosis Between Delirium and Dementia

In trying to make a differential diagnosis between delirium and dementia each of the following would be accurate EXCEPT

A) Delirium has a rapid onset and typically fluctuates. Dementia develops slowly and steadily.
B) Delirium often involves hallucinations and dementia rarely.
C) With delirium one has consistently poor insight, but with dementia there are often insightful periods.
D) Sleep is more disturbed with delirium than dementia.