The correct option is B Ionizing radiation
Ionising radiation are high energy electromagnetic waves. These have enough energy to ionise or remove electrons from an atom. The electromagnetic spectrum includes radiowaves, microwaves, infrared rays, visible light, ultraviolet rays, X-rays and gamma rays. Of these, only the short wavelength ultraviolet rays, X-rays and gamma rays are ionising. Since these have shorter wavelengths than the rest of the members in the electromagnetic spectrum, they possess highest amounts of energy.