A Raven's matrix uses a subtraction analogy: the third cell in each row equals the second cell 'minus' the first cell (shapes present in cell 2 but not in cell 1). Row 1: {circle, square}, {circle, triangle}, {triangle}. Row 2: {square, pentagon}, {square, hexagon}, ?
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A
{hexagon}
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B
{square}
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C
{pentagon}
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D
{square, hexagon}