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

When a mirror is placed on the line MN,

The facing of the figure to the left and right direction changes to the opposite direction in the mirror image(left facing changes to right and vice versa). There won't be change in top and bottom direction.

The semicircle which is at bottom will be at the bottom in the mirror image.

$$\therefore\ $$The mirror image of the given figure is

Hence, the correct answer is Option D