In Trying to Make a Differential Diagnosis Between Delirium and Dementia,which

In trying to make a differential diagnosis between delirium and dementia,which of the following would be accurate?

A) Delirium has a stable,rather than fluctuating,course.
B) Delirium often involves hallucinations,but dementia rarely does.
C) With delirium,one has consistently poor insight,but with dementia,there are often insightful periods.
D) Sleep is more disturbed with dementia than it is with delirium.