A pencil lies with its sharpened tip pointing right and a red eraser at the left end; a small label flag sticks up near the eraser. Which panel is its mirror image?

In the mirror the tip points LEFT, the eraser is at the right and the flag still sticks UP, now near the right end: (a). (d) turns the flag downward, (b) does both and the remaining panel has the flag on the wrong end.