To solve this problem, we need to determine how the pattern on the transparent sheet will look when folded along the dotted line. The dotted line suggests a vertical fold through the center of the figure.

Here's the step-by-step reasoning:

1. The given pattern consists of a square with a triangle and a semicircle. The dotted line runs vertically down the center of the square, bisecting the triangle and semicircle.
2. When the sheet is folded along the dotted line, each point on one side of the line moves to an equivalent point directly opposite it on the other side of the line.
3. In this figure:
   • The triangle, being bisected, will create a mirror image on the opposite side.
   • The semicircle will also mirror itself across the fold. The semicircle will appear as a complete circle on folding.
4. Thus, when folded, the pattern will look like a rectangle formed by combining two triangles, and a circle formed by two semicircles.

Based on the reasoning, the correct pattern will be the one where the two triangles meet to form a rectangle with a full circle in the middle.

The correct answer is: