What radioactive substance is often used for nuclear power

(Uranium Atoms)
Uranium is the fuel most widely used in nuclear reactors at power plants. Nuclear energy is created when uranium atoms are split in a process called fission. Uranium is also mildly radioactive.

not sure if this helps! :)

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this