A Nurse Is Caring for an 18-Month-Old Girl in the Pediatric

A nurse is caring for an 18-month-old girl in the pediatric intensive care unit. She was admitted following three days of bloody diarrhea and fever. Her parents report she had fewer wet diapers than normal. She was admitted with hyperkalemia, as well as increased blood urea nitrogen (BUN) and creatinine levels, indicating acute renal failure. After further lab work, the toddler is diagnosed with hemolytic uremic syndrome (HUS) , possibly caused by drinking unpasteurized milk.
-Why does a patient with HUS present with bloody diarrhea?

A) The blood is actually from the kidneys,which are in failure
B) The diarrhea is red in color because the body is shedding shiga toxin
C) Shiga toxin damages the gut lining,causing it to bleed
D) E.coli attaches to small bowel outpouchings and because of underlying thrombocytopenia,causes bleeding