Why Does Vitamin a Status Depend on the Person's Protein

Why does vitamin A status depend on the person's protein status?

A) Adequate protein intake is a marker for liberal intake of vitamin A.
B) Dietary protein assures synthesis of vitamin A's GI tract transporter.
C) Adequate protein intake reduces the risk for infection from bacteria that degrade vitamin A.
D) Transport of vitamin A within the body requires sufficient protein to synthesize retinol-binding protein.