A square tile with a grid of nine cells hangs just below a mirror fixed flat on the ceiling (dashed line). Which panel shows the tile in the ceiling mirror?

The ceiling mirror swaps the top and bottom rows and keeps the columns: the dot moves to the bottom-left cell, the green cell to the bottom-middle, the orange corner triangle to the top-left cell with its corner now at the top, and the blue arrow in the bottom-right cell now points DOWN from the top row: (d). (c) moves the arrow but leaves it pointing up, (a) swaps the columns and (b) does both.