The correct option is D bird
Answer is C.
Pitch describes how high or low a tone is and depends upon the rapidity with which a sounding body vibrates, i.e., upon the frequency of vibration. The higher the frequency of vibration, the higher the tone.
Among the voice of man, cow, bird and dog the voice of bird is shriller than other. Hence, the pitch or frequency of bird voice is more than man, cow and dog.