To determine if either object has a constant velocity, we need to consider the definitions of velocity and constant velocity. An object has a constant velocity if it moves in a straight line at a constant speed without changing direction.
Without specific information about the motion of objects C and D, it is impossible to determine whether either object has a constant velocity.
If you can provide details about the position, speed, or direction of objects C and D over time, I can help assess their velocities. Based on the available responses, you would choose the correct option depending on the information you have.