1. The problem involves folding a square transparent sheet along the diagonal dotted line from the top-left corner to the bottom-right corner. 2. The original pattern shows a right angle mark near the top-left corner and the letter "x" near the diagonal line on the top side. 3. When the sheet is folded along the diagonal, the top-left corner folds onto the bottom-right corner. 4. The right angle mark originally near the top-left corner will move to the bottom-right corner after folding. 5. The letter "x" remains near the diagonal line but its relative position changes accordingly. 6. Among the options, option (d) shows the right angle mark near the bottom-right corner and the letter "x" near the diagonal line, matching the expected folded pattern. Final answer: Option (d) is the correct representation of the pattern after folding.