A wide rectangular card is folded right half over left, then bottom half up. A triangle pointing right and a triangle pointing down are punched. Which figure shows the card opened?

Undo the bottom-top fold: the twins below are mirrored top to bottom, so the down triangle's twin points up and the right triangle's twin still points right. Undo the right-left fold: the four are mirrored onto the right, where right and left swap: (b).