If a Beneficial Drug Needed a Carrier Protein for It

If a beneficial drug needed a carrier protein for it to enter the target cells in muscles, a good protein to ensure the highest rate of delivery would be

A) a carrier protein with a glucose binding site.
B) a specific carrier protein found in muscle cells.
C) one that was present in the target cell membrane in high numbers.
D) bound to ATP to supply energy for rapid diffusion.
E) a specific carrier protein found in the brain for rapid diffusion.