A Car Is Rounding the Top, or Crest, of a Hill

Multiple Choice

A car is rounding the top, or crest, of a hill while moving at a steady 50 km/hr. What can you say about this car's acceleration, and why?

A) The car is accelerated, because its speed is changing.
B) The car is not accelerated, because its speed is not changing.
C) The car is not accelerated, because its direction of motion is not changing.
D) The car is accelerated, because its direction of motion is changing.
E) The car is not accelerated, because neither its direction of motion nor its speed are changing.