Answer: C. Speeds are the same
Step-by-step explanation:
Electromagnetic waves are waves which can travel through the vacuum. electromagnetic waves have electrical and magnetic component associated with them.
Electromagnetic spectrum involves gamma rays , X rays, ultra violet rays, visible rays, infrared rays, micro waves and radio waves which are arranged in order of increasing wavelength and decreasing frequency.
They all travel with the speed of light.The energy transport through a medium involves the absorption and re emission of the wave energy by the atoms of the material.