If an Animal Passively Conforms to Its External Environment and Encounters

If an animal passively conforms to its external environment and encounters an area with an unusually high solute concentration, it must be able to

A) move away from the high solute concentration.
B) alter the composition of its external environment.
C) tolerate a similarly high solute concentration to its internal environment.
D) actively regulate its internal environment.
E) prevent the high solute levels from crossing its cellular membrane.