Answer:
D. Sound
Step-by-step explanation:
Waves: one of the ways that energy may be transferred. Waves can be described as oscillations.
Electromagnetic (EM) waves are transverse waves.
EM waves can be separated into seven groups in the spectrum. From long wavelength to short wavelength:
- Radio waves
- Microwaves
- Infrared
- Visible light
- Ultraviolet
- X-rays
- Gamma rays
Sound waves are longitudinal waves.
The direction of oscillations is different between longitudinal and transverse waves:
- Longitudinal waves: the vibrations are parallel to the direction of wave travel.
- Transverse waves: the vibrations are at right angles to the direction of wave travel.