The Phenomenon of Parallax Is the

The phenomenon of parallax is the

A) change in the apparent position of a nearby object compared to background objects as a result of the motion of the object.
B) change in direction of motion of a planet from retrograde to direct motion.
C) apparent change in angular size of an object as it moves toward or away from an observer.
D) change in apparent position of a nearby object compared to background objects as a result of the motion of the observer.