To find the correct mirror image of the given figure when the mirror is placed at line MN, we need to understand how mirror images work. When an object is reflected in a mirror, the left and right sides of the object are flipped while the top and bottom remain the same.

Given the original figure is:

Steps to determine the correct mirror image:

1. The text "hiEraRchY" will appear reversed from left to right, where each letter is flipped horizontally.
2. The vertical position of each letter will remain unchanged.
3. Spaces and relative positions between characters will be preserved in the mirrored reflection.

Let's compare this logic to the options provided:

The first option is the correct mirror image of the given figure. It shows each letter flipped from left to right correctly while maintaining their original vertical alignment.

Hence, the correct answer is: