The correct option is D X-rays
X-rays is a form of electromagnetic radiation. Most X-rays have a wavelength ranging from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019Hz) and energies in the range 100 eV to 100 keV.
Hence, the rays or waves of 0.1nm is X-rays.