The characteristic of sound which helps to distinguish between a man's voice and a woman's voice is.

Answer is A.

Pitch of a sound depends upon the frequency of waves.
The greater the frequency, the higher is the pitch and vice versa. It is the pitch of sounds that enable us to distinguished between a sound of man and woman. Sound of a woman is shrill due to high pitch. Sound of a man is grave due to low pitch and low frequency.