Differentiate Between the Treatment Options for Folic Acid,iron,and Vitamin B₁₂

Differentiate between the treatment options for folic acid,iron,and vitamin B₁₂ deficiency,and select the true statement related to these deficiencies.

A) Erythropoietin therapy cannot reverse the effects of folic acid, iron, or vitamin B₁₂ deficiency.
B) Cyanocobalamin therapy is approved for the treatment of iron deficiency.
C) Floic acid deficiency is associated with pernicious anemia and can be treated with cyanocobalamin.
D) All of these are correct