A deer is running across a meadow at a speed of 15 m/s. Katie is riding in a car that is traveling at 25 m/s in the opposite direction as the deer. To Katie, the deer appears to be moving at a speed of 35 m/s.
Joan is standing still beside the meadow. To Joan, the deer appears to be moving at a speed of 15 ms.
Why do Katie and Joan believe the deer is traveling at different speeds?
A. Joan is not able to see clearly.
B. They are not the same height and weight.
C. They have different frames of reference.
D. Katie's car is going too fast.