The correct option is D All of the above
Nuclear disarmament: disarming and getting rid of nuclear weapons is a very significant way of eliminating the hazards associated with radioactive material.
Alternative sources of energy: seeking alternatives to nuclear energy will reduce the number of nuclear power plants in the world and thus reduce the risks that are associated with radioactive material.
Safe storage: radioactive pollution needs to be stored in specialized containers, which do not break easily and which do not allow radiation to seep out. So all of these methods will prevent radioactive pollution.