Which of the statements is true of saltwater and freshwater animal waste management systems?

Which of the statements is true of saltwater and freshwater animal waste management systems?
A) No saltwater or freshwater animals urinate.
B) Both saltwater and freshwater animals don’t need to eliminate waste, as it diffuses out of their bodies naturally.
C) Saltwater-based animals must have a mechanism to prevent water from trying to diffuse into their bodies.
D) Freshwater-based animals must have mechanisms to prevent water from trying to diffuse into their bodies.
*B is not the correct answer