What quantity does the line with the question mark represent?
a. amplitude of the wave
b. frequency of the wave
c. wavelength of the wave
d. period of the wave
![What quantity does the line with the question mark represent a amplitude of the wave b frequency of the wave c wavelength of the wave d period of the wave class=](https://us-static.z-dn.net/files/de9/691ee6398436a925a2e3a583435d9e53.png)