A 3×3 matrix shows shapes gaining one interior line per column (left to right). The top row has: plain circle, circle with 1 diameter, circle with 2 diameters. The middle-left cell is a plain triangle. What is in the middle-right cell?
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A
A plain triangle
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B
A triangle with one interior line
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C
A triangle with two interior lines
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D
A triangle with three interior lines