Select the correct mirror image of the given figure when the mirror is placed at MN as shown below.

To find the correct mirror image of the given figure when the mirror is placed vertically at MN (on the right side of the figure), let us analyze the relative positions of the elements step-by-step:

1. Horizontal Inversion (Left-to-Right Swap):
When a mirror is placed vertically at MN, elements on the left side of the original figure appear on the right side of the mirror image, and elements on the right side move to the left side.

2. Quadrant Analysis:
- Top-Left Quadrant: Contains the letter 'B' and a right-angled triangle inclined from bottom-left to top-center. In the mirror image, this entire set of features flips horizontally to the Top-Right Quadrant. The letter 'B' flips horizontally to become laterally inverted ('ℬ' / '𝔅'), situated near the top-right corner.
- Bottom-Right Quadrant: Contains the dollar symbol '$' and a diagonal line running from bottom-center to middle-right. In the mirror image, these elements shift horizontally to the Bottom-Left Quadrant, with the dollar sign laterally inverted.

3. Central Details & Hatching Lines:
- The small semicircle along the vertical dividing line faces to the left in the original image. In the mirror image, it must face to the right.
- The striped/hatched corner of the top triangle is along the top vertical line near the center, facing left; in the mirror image, it stays near the top vertical line, facing right.
- The striped/hatched corner of the bottom triangle is along the bottom vertical line near the center, facing left; in the mirror image, it stays near the bottom vertical line, facing right.

Comparing these observations with the options, the image in Option 2 perfectly matches all mirror image features.

Therefore, the correct mirror image is given by: