Every coloured cell of grid A moves in the same way to give grid B; a cell pushed off the bottom comes back in at the top. Do the same to grid C.

Every cell moves one row down: top-left to middle-left, middle-right to bottom-right, and the blue bottom-middle cell wraps round to the top-middle. In C the two orange top cells drop to the middle row, the blue centre cell drops to the bottom-middle and the bottom-left cell wraps round to the top-left: (d). (a) moves the cells right, (b) turns the grid and (c) flips it.