In a 3x3 matrix, the figure in each cell is a polygon. Moving from left to right across each row, one side is added to the polygon. Moving from top to bottom down each column, the polygon rotates 45 degrees clockwise. If the top-left cell contains an upright triangle, what is the figure in the bottom-right cell?
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A
A pentagon rotated 90 degrees clockwise.
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B
A square rotated 90 degrees clockwise.
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C
A hexagon rotated 45 degrees clockwise.
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D
A pentagon rotated 45 degrees clockwise.