A piece of paper is folded and a symmetrical figure is cut out from it. Which one of following shows half of the symmetrical figure that is cut out with the dotted line as the line of symmetry?

1. Identify the shape of the cut-out from the folded line

The cut-out shape on the folded line has a vertical left edge, a horizontal segment to the right, a V-shape (diagonally up then down), and a vertical right edge rising directly from the bottom of the V-shape.

2. Match the cut-out shape to the given options

When the paper is unfolded, the folded line becomes the line of symmetry. The half-figure shown in the options must match the cut-out shape exactly. Option (3) matches the description: vertical left edge, horizontal segment, V-shape, and vertical right edge.