SSC CHSL 7 Mar 2018 Shift 1 Paper

A horizontal mirror is placed, so the object on the top will appear at the bottom in reverse position and vice-versa.
So the triangle in the middle (with base at top side of square) facing downwards will now appear facing upwards, thus the second and last options will be eliminated.
Also, in the question figure at bottom right, the black colored triangle will appear at top right side, hence third option is the right image.