The Client Calls the Nurse and Is Very Frantic

The client calls the nurse and is very frantic. "I think something is wrong! My stools are black, and they have never been this color before!" The client is receiving ferrous sulfate (Feosol) . What is the best response by the nurse?

A) "This is an expected side effect of ferrous sulfate (Feosol) ; it is okay."
B) "This sounds serious; you may have started bleeding again."
C) "Do you have hemorrhoids? That could be the problem."
D) "I will speak with your doctor and call you right back."