You Are Watching a Tennis Match and Your Seat Is

You are watching a tennis match and your seat is located at the side of the court, in line with the net. If you keep your eyes on the net but move your head from side to side, the people on the other side of the court will appear to ________.

A) not move at all
B) move toward you
C) move in a direction opposite to your head movement
D) move in the same direction that your head is moving