A transparent sheet with a pattern is given below. Select the option that depicts the pattern that would appear when the given transparent sheet is folded at the middle horizontal line.

When a transparent sheet is folded along a horizontal line, the pattern on the folded half creates a vertical mirror image across that folding line.
1. Looking at the options, the top half becomes empty (dotted), which means the top half is folded downwards onto the bottom half.
2. In the top half, the arrow goes from the middle line up to the top-right corner.
3. When flipped vertically downwards over the middle line, its reflection will go from the middle line down to the bottom-right corner.
4. This reflected arrow perfectly overlaps with the existing arrow in the bottom half, which already points from the middle line to the bottom-right corner.

Therefore, the resulting pattern will show only a single arrow in the bottom half pointing towards the bottom-right corner. This corresponds to Option B.