Study how figure A becomes figure B, then find the figure that is related to C in the same way.

B is the mirror image of A in an upright mirror: the arrow that pointed up-right now points up-left and the square jumps from the bottom-right to the bottom-left. Mirroring C the same way puts the circle at the top-left, the dot at the top-right and the triangle in the bottom-right corner with its right angle on the right: (b). (a) is the water image, (d) a half-turn, and in (c) the triangle has only been slid across, not flipped.