A Woman Has Experienced Iron Deficiency Anemia During Her Pregnancy

A woman has experienced iron deficiency anemia during her pregnancy.She had been taking iron for 3 months before the birth.The client gave birth by cesarean 2 days earlier and has been having problems with constipation.After assisting her back to bed from the bathroom,the nurse notes that the woman's stools are dark (greenish-black) .What should the nurse's initial action be?

A) Perform a guaiac test, and record the results.
B) Recognize the finding as abnormal, and report it to the primary health care provider.
C) Recognize the finding as a normal result of iron therapy.
D) Check the woman's next stool to validate the observation.