D: light waves in a vacuum
Light and sound both move in waves, one is detected by your ears, one is detected by your eyes. However, light travels faster in a vacuum because light bounces off of matter and energy AKA air, water, earth, plasma, basically anything.
Sound on the other hand cannot travel In a vacuum and moves it's fastest through a solid, slower through a liquid, and it's slowest through air.
Because light travels sooo much faster than sound, answer D is the correct answer!
I hope this helped!
