Question

how is the radioactive energy removed from a nuclear power plant’s spent fuel rods? the energy is only removed when it changes to a safer form. the fuel rods are scrubbed clean, removing the energy. the fuel rods are destroyed, removing the energy.

Explanation:

Radioactive energy in spent fuel rods remains until the radioactive isotopes decay to a more stable (safer) form. Scrubbing doesn't remove the energy, and destroying the rods doesn't remove the energy but rather spreads radioactive material.

Answer:

The energy is only removed when it changes to a safer form.