Consider a 3x3 matrix where each cell contains a shape. The first row contains: a circle, a triangle, and a circle with a triangle inside. The second row contains: a square, a plus sign, and a square with a plus sign inside. The third row contains: a diamond, a vertical line, and a missing shape. Which of the following shapes completes the matrix?
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A
A diamond with a vertical line inside.
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B
A circle with a square inside.
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C
A diamond.
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D
A vertical line inside a circle.