Folding a square sheet left onto right, then top onto bottom, gives a small folded piece. A hole is punched exactly on the top-right corner of the folded piece, so only a quarter of the hole is cut. Which figure shows the opened sheet?

That corner lies on the second crease (the folded top edge) and on the sheet's right edge. Opening the second fold joins two quarters into a half-circle notch on the right edge; opening the first fold mirrors it to the left edge. So two half-circle notches at the middle of the left and right edges: (c).