To solve this problem, we need to determine the correct mirror image of the given figure when a mirror is placed vertically along the line MN. This involves visualizing how the figure would look if reflected across this line.

### Steps to Solve:

1. **Understand the Positioning:**
   • The mirror is placed along the right side of the figure. Thus, the reflection will horizontally invert the image from left to right.
2. **Analyze Each Part:**
   • Starting from the left side, each letter will be flipped horizontally. For example, "B" will appear inverted.
   • Each letter must maintain its order from top to bottom as the mirror is vertical, not horizontal.
3. **Apply Horizontal Reflection:**
   • The right side of each letter will become the left side and vice versa. This typically results in a visual 'flip' of each character across the vertical axis.
4. **Identify the Correct Option:**
   • Compare all options with this reflection logic.
   • The correct mirror image should exactly match the horizontally flipped version of the original image along the line MN.

Based on the above interpretation, the option that correctly represents the mirror image of the given figure is displayed below:

This option accurately reflects the original image according to the placement of the mirror along MN.