A Patient Presented with an Acute Abdomen Including Fever, Marked

A patient presented with an acute abdomen including fever, marked abdominal distension, acidosis, and leukocytosis. Laparoscopy revealed that large parts of the small intestine were necrotic, and as a consequence the entire ileum of the patient was resected. It is expected that very soon after the surgery the patient will have considerable problems resulting from the malabsorption of which of the following?

A) bile acids
B) iron
C) protein
D) sodium
E) vitamin B₁₂