Choose the word that best completes the following sentence. a star has ; it appears to be moving across the sky as a night progresses.
(a)-apparent motion
(b)-endless motion
(c)-excess energy
(d)-mass

Apparent motion

Explanation:

The stars rise in the east, move in the sky in the west direction until it reaches its highest point in the sky, from here they descend until they hide in the west. This apparent change of position of a star in the sky is called apparent motion,  this is a consequence of the Earth's rotation, which makes us believe that in appearance a star or a constellation has shifted in the sky throughout the night.

the object is standing still. (answer on edu)