Of What Advantage Is a Large Surface-Area-To-Volume Ratio to the Platyhelminthes

Of what advantage is a large surface-area-to-volume ratio to the Platyhelminthes?

A) It enables them to live in dry habitats.
B) It enables them to survive on very little oxygen.
C) It enables the efficient transport of gases and nutrients without specialized structures.
D) It enables their blood vessels to transport oxygen and carbon dioxide more efficiently.
E) None of the above are advantages.