Which of the Following Statements Regarding Saltwater Fish Is True

Which of the following statements regarding saltwater fish is true?

A) The concentration of solutes in the internal fluids of saltwater fish is much lower than in the surrounding water.
B) The concentration of solutes in the internal fluids of saltwater fish is higher than in the surrounding environment.
C) Saltwater fish must visit freshwater streams and rivers entering the ocean to maintain the correct concentration of solutes in their internal fluids.
D) Saltwater fish produce large amounts of diluted urine.