A 3×3 grid contains shapes that rotate 45° clockwise with each step. The top-left has an arrow pointing up, top-center points upper-right, top-right points right. The middle-left points upper-left, middle-center is missing. What belongs in the middle-center?
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A
Arrow pointing down
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B
Arrow pointing upper-right
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C
Arrow pointing left
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D
Arrow pointing lower-right