A square piece of paper is folded in half vertically (left half onto right half), then folded in half horizontally (top half onto bottom half). A hole is punched through all layers at the center of the folded paper. When completely unfolded, how many holes appear?
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A
1 hole in the center
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B
2 holes aligned vertically
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C
4 holes arranged in a 2×2 pattern
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D
8 holes arranged in two rows