In a Vision Experiment, Subjects Are Asked to View Stimuli

In a vision experiment, subjects are asked to view stimuli that include vertical black-and-red bars, as well as horizontal black-and-green bars, for a few minutes. Given what you know about the McCullough effect, what afterimages should the subjects see when presented with vertical or horizontal arrays of black-and-white bars?

A) Vertical white bars would appear green and horizontal white bars would appear pink.
B) All white bars will be seen as a pale purple.
C) Vertical white bars would appear pink and horizontal white bars would appear green.
D) Vertical white bars would appear blue and horizontal white bars would appear yellow.