According to Information Presented in the Text, Why Was Disruptive

According to information presented in the text, why was Disruptive Mood Dysregulation Disorder added to DSM-5?

A) The criteria for Major Depressive Disorder were not applicable to many young children with depression.
B) Many children were being misdiagnosed with Bipolar Disorder.
C) Children with depression tended to show fits and tantrums, rather than periods of sadness and social withdrawal.
D) Disruptive Mood Dysregulation Disorder describes dysthymia in preschool-age children.