Birds that live in marine environments and thus lack access to fresh drinking water

A) osmoregulate without using a transport epithelium for this purpose.
B) drink seawater and secrete excess ions through their kidneys only.
C) drink seawater and secrete excess ions mainly through their nasal salt glands.
D) have plasma that is isoosmotic to ocean water.
E) obtain water by eating only osmoregulating prey.