A New Mother Is Changing the Diaper of Her 20-Hour-Old

A new mother is changing the diaper of her 20-hour-old newborn and asks why the stool is almost black. Which response by the nurse would be most appropriate?

A) "You probably took iron during your pregnancy."
B) "This is meconium stool, normal for a newborn."
C) "I'll take a sample and check it for possible bleeding."
D) "This is unusual and I need to report this."