We Identify the Direction of a Source of Sound by Attending

We identify the direction of a source of sound by attending to the

A) difference between responses from the left ear and those from the right ear.
B) velocity of impulses coming from hair cells in the basilar membrane.
C) changes in loudness from the beginning of the sound to the end of the sound.
D) difference between the responses of hair cells at the stirrup end of the basilar membrane and responses of hair cells at other locations.