The correct answer to the question is : B) It has a very long life.
Step-by-step explanation:
The main hazardous problem of nuclear waste is that it has a very long life. The waste radioactive materials are still dangerously radioactive for so many years as they are not in any use in any commercial sectors.
Hence, the correct answer to the question is that nuclear waste has a very long life which makes it difficult to dispose responsibly.