Select the correct mirror image from the answer figures when the mirror is placed on the line PQ as shown in the question figure.

When a mirror is placed on the line PQ,

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

The two circles which are towards top right will be towards top left in the mirror image.

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

Hence, the correct answer is Option D