Kateria Stares at an Image of the U

Multiple Choice

Kateria stares at an image of the U.S.flag with the stars black, the field around the stars yellow, and the stripes black and green.She then stares at a white sheet of paper.The after-image of a red, white, and blue flag is explained by the _____ theory of color vision.

A) trichromatic
B) opponent-process
C) accommodation
D) gate control