In this question, we are given a figure of a square transparent sheet with a pattern and we have to determine how the pattern would appear after folding the sheet at the dotted line.

Option 1 is the correct answer because it shows the pattern after folding the sheet along the dotted line. The pattern remains the same, just in a different orientation. This means that the lines and shapes in the pattern stay the same, they are just rearranged.

Option 2 is not the correct answer because it shows a completely different pattern compared to the original pattern. The lines and shapes do not match with the original figure.

Option 3 is also not the correct answer because it shows a different pattern compared to the original figure. The lines and shapes are not arranged in the same way as the original pattern.

Option 4 is not the correct answer because it shows a different pattern compared to the original figure. The lines and shapes do not match with the original pattern.

Therefore, option 1 is the correct answer as it accurately represents the pattern after folding the transparent sheet along the dotted line.