$64)$ The reason that you do not observe a Doppler shift when you listen to the car radio while driving is

that $64)\_\_\_\_\_\_$

A$)$ the speed of the car is too slow compared to the speed of sound.

B$)$ there is a Doppler shift but we don't notice it$.$

C$)$ the speed of the car is too fast compared to the speed of sound.

D$)$ the air inside the car is moving at the same speed as the car.

E$)$ the source and observer are moving at the same speed.