Which Statement Best Describes the Onset of Bipolar Disorder

Multiple Choice

Which statement best describes the onset of bipolar disorder

A)  The peak age of onset is during middle or late adulthood (age 40 and on) . 
B)  The onset of bipolar disorder is spread evenly across almost all age groups. 
C)  The peak age of onset is usually in early adulthood (ages 20 through 29) . 
D)  The symptoms tend to be most severe when the disorder has a late onset.