Question

An object in circular motion has velocity that is constantly changing. The direction of the acceleration is

Answer 1

Answer: Toward the center of the circle.

This situation is characteristic of the uniform circular motion , in which the movement of a body describes a circumference of a given radius with constant speed.  

However, in this movement the velocity has a constant magnitude, but its direction varies continuously.

Let's say $\vec{V}$ is the velocity vector, whose direction is perpendicular to the radius $r$ of the trajectory, therefore   the acceleration $\vec{a}$ is directed toward the center of the circumference.