Which statement best describes a risk associated with using radioisotopes in nuclear reactors? a radioisotopes are very expensive and do not produce the amount of energy that coal and oil produce. b if the radiation were to leak out of the reactors, it could produce an abundance of new plants and organisms. c radioisotopes are extremely difficult to obtain and can only be retrieved from the sun. d if the radiation were to leak out of the reactors, it could cause significant damage to living organisms.