A.
pixel.setBlue(pixel.getRed()); pixel.setBlue(pixel.getRed());
B.
pixel.setRed(pixel.getBlue()); pixel.setGreen(pixel.getBlue());
C.
pixel.setGreen(pixel.getRed()); pixel.setBlue(pixel.getRed());
D.
pixel.setRed(pixel.getGreen()); pixel.setBlue(pixel. getGreen ());