Direction: Select the possible fold of the transparent paper sheet from the…

Concept: A transparent sheet folded along a crease behaves like a mirror — every mark on the moving flap is reflected across the crease line and, because the sheet is see-through, comes to lie on top of the layer beneath it. Marks that land in the same cell are read superimposed (for example a '×' laid over a '+' together look like a single asterisk '✱'), and no individual mark is ever rotated — only reflected.

Applying it here: fold the left flap onto the middle column, then bring the top strip down and the bottom strip up along their creases. Track each cell as it reflects — the left-pointing arrow becomes right-pointing, the '×' and '+' overlap into an asterisk, and the equals sign, envelope, bold arrowhead and wavy mark each carry through their reflections. The step-by-step fold is shown below.

Cross-check: in the completed fold the two short parallel bars sit beside the bold arrowhead, the asterisk beside the envelope, and the wavy mark beside the thin arrow. The arrangement whose marks are the exact left-right mirror of this cannot come from a real fold, which is why it is rejected.