which refers to the number of wavelengths that pass a fixed point in a second?\no wavelength\no amplitude\no…

Brief Explanations:

Frequency is defined as the number of wavelengths (or cycles) that pass a fixed - point in one second. Wavelength is the distance between two consecutive points in phase on a wave. Amplitude is the maximum displacement of a wave from its equilibrium position. Compression is related to the density of particles in a longitudinal wave.

Answer:

C. frequency