If the water line is placed along X-Y below the figure, which of the given…

Concept

A water reflection across a horizontal line is a top-bottom inversion. Every point keeps the same horizontal position and moves to the same perpendicular distance on the opposite side of the line.

Therefore, left and right remain unchanged, while upper and lower positions, slopes, and vertical orientations are reversed.

Application

1. Locate the water line X-Y below the figure. It is horizontal, so compare vertical positions while preserving left-right positions.

2. The linked symbols and the oval lie in the upper-right region, so their reflection must lie in the lower-right region, with their vertical arrangement inverted.

3. The small triangular part lies below and left of the central bend, so it must appear above that bend on the same left side.

4. The long diagonal that runs down from the upper-left to the central bend must run up from the lower-left to the corresponding bend in the reflection.

Cross-check

The figure with the long diagonal starting at the lower-left, the small triangle in the upper-left area, and the linked symbols with the oval in the lower-right satisfies all three position checks. Reflecting it again across a horizontal line restores the original figure.

Thus, the required water reflection is the figure with the small triangle above the central bend, the long diagonal rising from the lower-left, and the linked symbols beside the oval in the lower-right.