One of the Primary Differences Between Major Depression and Dysthymia

One of the primary differences between major depression and dysthymia is that:

A) dysthymia is more chronic with shorter intervals of normal mood than major depression.
B) major depression includes physical symptoms, while dysthymia does not.
C) major depression includes mostly cognitive symptoms, while dysthymia consists of more motivational symptoms.
D) dysthymia has more intense depressive symptoms than major depression does.