The Ease with Which Iron Can Move from a Reduced

The ease with which iron can move from a reduced form to an oxidized form in its metalloprotein transferrin is important because:

A) only the reduced form of iron can be stored as transferrin.
B) transport of iron in transferrin occurs only in the oxidized state.
C) it can block the excessive uptake of copper in hepatocytes.
D) the oxidized form of iron reacts best when binding oxygen.