Multicellular Organisms Must Keep Their Cells Awash in an "Internal

Multicellular organisms must keep their cells awash in an "internal pond" because

A) feedback signals cannot cross through the interstitial fluid.
B) cells need an aqueous medium for the exchange of nutrients, gases, and wastes.
C) this prevents the movement of water due to osmosis.
D) cells need to be protected from nitrogen gas in the atmosphere.
E) terrestrial organisms have not adapted to life in dry environments.