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.

Bipolar Disorder

This disorder entails a notable divergence in emotional state, veering between euphoria or elevated mood (mania or hypomania) and profound sadness (depression).

Peak Age

The age at which an individual reaches their highest level of ability or performance in a particular field or physical capacity.

Early Adulthood

A life stage marking the transition into adult roles, typically ranging from the late teens through the twenties.