Question

An object moving in a circle at a constant speed is accelerating. Why?
A. because it is going faster
B. because it has constant velocity
C. because its direction is changing
D. because the distance it is traveling is changing

Answer 1

"Acceleration" does NOT mean 'speeding up'.  It means any change
in the speed or direction of motion ... speeding up, slowing down, or
moving in a curve.

An object moving in a circle at a constant speed is accelerating, because
when you're moving along a circle, your direction is constantly changing.

Answer 2

A. Because it is going faster.