The orange cells and the blue cells of grid A move in different ways to give grid B. A cell pushed off one edge comes back in at the opposite edge. Which grid comes from C?

Each orange cell moves one cell to the right and each blue cell moves one cell down, wrapping round at the edges (the blue cell in the bottom row comes back in at the top). In C the orange cells go from the top-middle and bottom-right to the top-right and bottom-left, and the blue cells go from the top-left and middle-right to the middle-left and bottom-right: (c). (a) moves every cell right, (b) moves every cell down and (d) gives each colour the other colour's move.