Based on the information provided, if only paper clips W and X moved toward the magnet, it suggests that the magnet's effective range for attracting paper clips is limited. If W and X are the only ones moving, it indicates that the distance at which the magnet can attract paper clips is at or less than the distance of W and X from the magnet.
Without specific distances indicated in the picture (which is not provided here), the correct answer would depend on the maximum distance of either W or X. However, considering the options given, if we take 4 centimeters and 5 centimeters to be plausible maximum distances that could indicate the range of the magnet's effectiveness, the answer would generally tend to indicate that beyond these distances (especially 7 or 10 centimeters), the magnet does not work well.
Therefore, the best answer among the options given, considering common scenarios like this, would likely be:
5 centimeters away.
This option suggests that the magnet does not successfully attract paper clips at distances greater than that.