Answer:
C) Spent nuclear fuel is highly radioactive and can damage organisms and the environment.
Step-by-step explanation:
Spent nuclear fuel rods are held in under water pools for decades to cool them off. The circulating water removes the heat away from the fuel rods. Also water acts as a good radioactive shield as fuel rods are still highly radioactive. Eventually after many years when fuel rods are inert thy can be moved to dry casks.