That a Strong Motion Aftereffect Is Obtained When One Eye

That a strong motion aftereffect is obtained when one eye is adapted and the other is tested suggests that

A) the motion aftereffect works better with one eye.
B) adaptation is responsible for the motion aftereffect.
C) testing the other eye increases the chance of seeing a motion aftereffect.
D) the motion aftereffect occurs in a part of the visual system where information from the two eyes is combined.
E) The motion aftereffect occurs at the level of the retina.