To determine the correct mirror image, we need to follow these steps:

1. Identify the position of the mirror line. A mirror line divides a figure into two symmetrical halves.
2. Examine how each part of the figure transforms when reflected. In a mirror image, the orientation of figures and text is reversed. Left becomes right and vice versa.
3. Compare the given options with this transformation to find the exact mirror image.

Let's analyze the given figure:

By placing the mirror on the shaded line, the left side will appear on the right and vice versa in the mirror image.

Now, let's compare with each option to find the correct mirror image:

1. Option 1:
2. Option 2:
3. Option 3:
4. Option 4:

The correct mirror image is the first option:

This option accurately reflects the original figure across the given mirror line. The shapes and orientations match the expected mirrored positions.

Conclusion: The correct answer is the first option.