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 colour before!" The client is receiving ferrous fumarate (Palafer) . What is the best response by the nurse?

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