. idea that the ears receive slightly different inputs when the sound source is located to one side or the other. b. location of the sound in space. c. difference in time between a sound arriving at one ear versus the other. d. angle of a sound source on the horizontal plane relative to a point in the center of the head between the ears. e. distance between the sound and the ears.

hello your question is incomplete below is the missing part

What is Azimuth ?

answer : angle of a sound source on the horizontal plane relative to a point in the center of the head between the ears ( D )

Explanation:

Azimuth is the described as angle of a sound source ( between the North ) and it is measured in a clockwise direction in relation to the observer ( Human ear )

Hence the option that fits in is : angle of a sound source on the horizontal plane relative to a point in the center of the head between the ears

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me