Answer: C.) The cells might swell and burst.
Step-by-step explanation:
The salt water can be considered as hypotonic solution in which the concentration of salt outside the body is more than inside the fish body hence, the fish body will prevent the entry of water. The freshwater can be considered as hypertonic solution. The concentration of solute inside the body is more than outside the body. The water is expected to enter inside the body of the fish. Hence, the cells might swell and burst.