Based on the Work of Lewinsohn Et Al

Based on the work of Lewinsohn et al., and others, which of the following statements regarding bipolar disorders is correct?

A) The median duration of the most recent manic episode was 10.8 months.
B) Youngsters with a diagnosis of bipolar disorder had a later age of onset for their affective disorder than youngsters with major depression.
C) The total amount of time with an affective disorder was longer for the youngsters with depression than for those with bipolar disorders.
D) Approximately 2% of the adolescents had a chronic course (nonstop symptoms until age 24) .