If a mirror is placed on the line AB, then which of the answer figures is the right image of the given figure?

A horizontal mirror is placed, so the objects will turn upside down in the mirror image (e.g - an object at top right will appear at bottom right). So, the semi circle at the top right hand corner will appear at the bottom right corner in the mirror image, and thus the second and third options are eliminated.

Also, the semi circle will face the side, and not the base and so the last option is also not possible.

=> Ans - (A)