A Recent Graduate Nurse Working in an Urban Labor and Delivery

A recent graduate nurse working in an urban labor and delivery unit had a patient who experienced a difficult labor. The mother, suffering from postpartum depression (PPD) , committed suicide a year after giving birth. Although the nurse knew the basics about PPD, the nurse immediately studied the condition in depth and learned that PPD:

A) Can be triggered by a massive hormone drop following delivery.
B) Can intensify to cause delusions.
C) Occurs soon after delivery.
D) All of the above.