Answer:
A. The disposal of used nuclear fuel rods and the security of the plants themselves is of concern.
Step-by-step explanation:
If the waste from the nuclear disposal is leaked, it could took thousands of years before the radioactivity is gone from the environment. If people live in close proximity with this radioactive substance, they will develop dangerous health issues that often resulted on death.
Beside the dangers of it disposals, nuclear power plants could create a national security risk. Meaning that it can easily be target by terrorist groups who want to create overwhelming damage in one action.