The Official Statement of the American Psychiatric Association on ADHD

The official statement of the American Psychiatric Association on ADHD, according to Leo, is that it is a disease

A) that there is no doubt whatsoever that it is biologically based.
B) that has probable biological roots, but it is still unclear what causes it and if there may be other reasons to account for its presence in children.
C) that has very little scientific data that support it as biologically rooted.
D) that the American Psychiatric Association has never addressed.