Which among the following cause radioactive pollution ?

All of these .

Radioactive pollution is the physical pollution of air , water and soil with radioactive substances. It can be caused by :-
Atomic weapons and explosions  ,Atomic reactors, Nuclear fuel
Mining of radioactive materials , Nuclear explosions, Nuclear weapons testing, Production and decommissioning of nuclear weapons ,The mining of radioactive minerals ,The handling and disposal of radioactive waste ,Accidents at nuclear power plants.