Which statement best describes frequency and pitch?

a. frequency and pitch are the same as wavelength and velocity.
b. frequency and pitch are never found in a description of the doppler effect.
c. frequency and pitch are the opposite of wavelength and velocity.
d. pitch is how frequency is perceived.

A. frequency and pitch are the same as wavelength and velocity.

Sorry if im wrong

The right choice is D. Pitch is how frequency is perceived

Pitch perception allows us to order sounds on a musical scale. In simpler words pitch is the quality that makes it possible to judge sounds as "higher" and "lower" in the sense associated with musical melodies. So it is related to frequencies in the term that a sound having higher frequencies will have higher pitch and vice versa. SO we distinguish the sounds pitch by their frequencies.