Concept:Radioactivity is a spontaneous nuclear process that is independent of external physical or chemical conditions.Explanation:The correct statements are:• It is not affected by temperature or pressure.• It is spontaneous.• It is a nuclear phenomenon.Radioactivity is not dependent on chemical combination, and it is not generally true that all radioactive emissions are deflected by electric and magnetic fields, since gamma rays are not deflected.Hence, the true statements are i, ii and v only.Answer:D. i, ii and v only