Respuesta :
Answer:
a. Longitudinal waves
Explanation:
A longitudinal wave is a wave in which the propagation of the wave is in the same direction as the displacement of the medium carrying the wave.
It is also a type of wave in which the direction that the wave moves is parallel to the direction that the particles of the medium (which carry the wave) move.
Examples of longitudinal waves include seismic waves, and sound waves.