The Earlier Concept of "Masked" Depression Was That ____

 The earlier concept of "masked" depression was that ____.

A) children wear a characteristic "mask" of depression, including downcast eyes and downturned mouth
B) depression is difficult to diagnose in children because they "mask" their feelings with a happy face
C) children purposely conceal or "mask" their depression so as to avoid treatment
D) depression could be "masked" or concealed by a variety of other behaviors, and thus, any clinical symptom could be evidence of underlying depression