D-Glucose and D-Mannitol Are Similarly Soluble, but D-Glucose Is Transported

D-Glucose and D-Mannitol are similarly soluble, but D-Glucose is transported through the erythrocyte membrane four times as rapidly as D-Mannitol. What is the most likely explanation?

A) D-Glucose undergoes simple diffusion more rapidly than D-Mannitol because glucose is less polar.
B) D-Glucose and D-Mannitol enter the erythrocyte via an ion-gated channel.
C) D-Glucose and D-Mannitol are transported via a system that distinguishes the two sugars.
D) D-Glucose flux through the membrane is linear, whereas D-Mannitol flux is described by a hyperbolic curve.
E) None of the above provides the explanation.