In a 3×3 matrix, the number of sides on each shape increases by 1 across each row (triangle=3, square=4, pentagon=5). The shading rotates: row 1 is solid, row 2 is striped, row 3 is empty. What belongs in the bottom-right cell?
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A
An empty pentagon
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B
A solid hexagon
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C
A striped pentagon
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D
An empty hexagon