The Nurse Is Emptying the Bedside Commode of a Patient

The nurse is emptying the bedside commode of a patient with chronic leukemia and notes that the stool is very dark.Which assumption should guide the nurse's action?

A) The patient may be bleeding.
B) The patient may be dehydrated.
C) The patient is most likely on iron supplements.
D) The patient ate something that turned the stool a dark color.