Let's say you are chasing on foot a police car driving at full speed, with lights on and sirens blazing. Assuming neither you nor the police car change speed or direction, you will hear the siren's pitch as ________ than it actually is because __________.
A. higher; the car is driving away from you
B. lower; the car is driving away from you
C. lower; you are running towards the car
D. higher; you are running towards the car