At Her 6-Week Postpartum Checkup,a Woman Mentions to the Nurse

At her 6-week postpartum checkup,a woman mentions to the nurse that she cannot sleep and is not eating.She feels guilty because sometimes she believes her infant is dead.The nurse recognizes this woman's symptoms as:

A) bipolar disorder.
B) major depression.
C) postpartum blues.
D) postpartum depression.