Explanation:

E = hf
So, if you increase the frequency of the wave, you get more energy per photon.
Radio waves have photons with low energies, microwave photons have a little more energy than radio waves, infrared photons have still more, then visible, ultraviolet, X-rays, and, the most energetic of all, gamma-rays. Since, gamma rays is not in the option, so X-Ray is the correct answer