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