After Staring at a Particular Color for a Long Period

 After staring at a particular color for a long period of time and then looking at a white background,a negative afterimage occurs because the ____. 

A) cones that were not used as much to sense the particular color are well-rested and therefore respond more readily to the white background
B) well-rested rods take over the task of sensation, thus distorting the color that is sensed
C) parts of the cells that continually responded to the color are worn out and therefore don't respond as readily to the white background
D) parts of the cells that continually respond to white are worn out and therefore don't respond as readily to the white background