Answer the following question given this paragraph: 

Wave amplitude of a transverse wave is the difference in height between a crest and the resting position. Wave amplitude of a longitudinal wave is the distance between particles of the medium where it is compressed by the wave.


Q: Wave amplitude of a transverse wave is the difference in height between what and the resting position?

 Choices:

- a valley

- a cascade

- a magnitude

- a crest

A:
a crest
