How Does Dysthymia Differ from Major Depression

How does dysthymia differ from major depression?

A) In major depression rates increases in certain age groups but in dysthymia, the rates of increase is stable from age 18 to 64. Dysthymia tends to be chronic while major depression is time-limited.
B) Major depression increases with age due to life stressors and situational factors. Dysthymia seems to decrease in intensity with age.
C) Men seem to be more vulnerable to dysthymia and women are more vulnerable to major depression.
D) Dysthymia tends to be acute and pervasive, while major depression is chronic and developmental.