Which Feature Characterizes Pernicious Anemia

Which feature characterizes pernicious anemia?

A) Red blood cells develop prematurely
B) Most commonly caused by a lack of vitamin B₂ in the diet
C) Associated with a peptide called intrinsic factor, which blocks absorption of vitamin B₁₂ in the small intestine
D) Associated with a strict vegetarian diet, such as one without dairy or over-the-counter vitamins
E) Can be caused by an inability to absorb vitamin K