The opened sheet shown at the top was folded once and punched. Each option shows a folded sheet (crease dotted) with its punched holes. Which one gives exactly the opened sheet?

The four holes pair up as mirror images in the diagonal from top-left to bottom-right (1 across, 3 down with 3 across, 1 down; 2 across, 7 down with 7 across, 2 down). Folding along that diagonal and punching one hole of each pair gives exactly this sheet: (b). The others add holes that are not there.