Solution:
The given pattern is on a transparent square sheet (X) with a dotted line indicating the fold line on the right side of the square.
When the sheet is folded along the dotted line, the right portion of the sheet will be flipped over to the left side. This will cause the pattern from the right side to be mirrored and placed adjacent to the left side pattern.
Let's analyze the pattern step-by-step:
- The left side of the square (before the dotted line) has a series of vertical and horizontal black and white lines in different sections.
- The right side of the square (after the dotted line) contains a vertical striped pattern.
- When folded, this vertical striped pattern on the right will flip horizontally and appear on the left side of the fold line.
- Thus, the combined pattern after folding will have the original left side pattern plus the horizontally mirrored right side pattern adjacent to it.
Out of the four options, only option (4) correctly shows the pattern with the vertical stripes mirrored and placed on the left side, matching the fold.
Therefore, the correct answer is option D (4).