When light from a flashlight is moved quickly back and forth on a wall in a darkened room, it can appear to observers that there is a trail of light moving across the wall, even though physically the light is only in one place at any given time. This experience is an effect of memory that occurs because of

This experience is an effect of memory that occurs because of iconic memory.

Explanation:

Iconic memory is a part of visual memory that lasts only for milliseconds. Everybody has experienced an example of iconic memory in their lives. For instance, when we turn off the lights and still have an a quick memory of what the room looked like when the lights were on. Or when we stare at our phones and then close our eyes, but can still "see" the phone screen from a moment ago. That is the same explanation for the appearance of a trail of light when the light is physically only in one place. Our brain can still "see" where the light was, before that iconic memory fades.

answer; deviation iq; //(a)

i think it is the third one.