A Patient Who Is Visiting the Clinic Complains of Having

A patient who is visiting the clinic complains of having "stomach pains for 2 weeks" and describes his stools as being "soft and black" for approximately the last 10 days.He denies taking any medications.The nurse is aware that these symptoms are mostly indicative of:

A) Excessive fat caused by malabsorption.
B) Increased iron intake, resulting from a change in diet.
C) Occult blood, resulting from gastrointestinal bleeding.
D) Absent bile pigment from liver problems.