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

To find the correct mirror image of the given combination when a vertical mirror is placed at line MN on the right side of the combination "W e 6 3 B F", we follow the fundamental rules of lateral inversion:

1. Reversal of Character Order: The character closest to the mirror (on the far right side) appears first (on the far left side) in the mirror image. Thus, the order of characters from left to right in the mirror image will be reversed, starting with the mirror image of 'F' and ending with the mirror image of 'W'.

2. Lateral Inversion of Individual Characters:
- F: The vertical line stays, but the horizontal bars facing right now face left, appearing as Ⅎ.
- B: The straight vertical line moves to the right, and the loops face left, appearing as 𐐒.
- 3: The open curve facing left now faces right, appearing as Ɛ.
- 6: The loop at the bottom-left flips to the bottom-right, appearing as ∂.
- e: The loop and open mouth reverse direction, appearing as ɘ.
- W: The character is symmetrical across a vertical axis, so its shape remains W.

Combining these horizontally inverted characters from left to right gives the mirrored sequence: Ⅎ 𐐒 Ɛ ∂ ɘ W.

Comparing this sequence with the given options, the image shown in the fourth option correctly represents the mirror image: