All of the Following Are Valid Reasons for the Increase

All of the following are valid reasons for the increase in rates of depression in the United States, EXCEPT:

A) a reduction in the stigma associated with emotional distress
B) an improvement in the criteria for diagnosing depression in childhood
C) a tendency to overdiagnose the disease in cases where the depression is a normal response to life events
D) the criterion about the length of a major depressive episode allows for diagnoses of it in cases of normal stress responses