When an Object Moves Uniformly at a Constant Speed in a Circle

When an object moves uniformly at a constant speed in a circle, the acceleration of the object is always:

A) outward, away from the center of the circle.
B) zero; the object is not accelerating, since it is moving uniformly at a constant speed.
C) inward, toward the center of the circle.
D) along the direction of the path, tangential to the circle.