Visual IQ puzzle (MENSA Denmark, difficulty 3)
Correct answer: C
Explanation: Comsider each row. The figure in the middle indicates the axis along which the figure on the left has to be mirrored in otder to obtain the figure on the right. The first figure of the first row has to be mirrored along a diagonal axis from top-left to bottom-right. The first figure of the second row has to be mirrored along a horizontal diagonal. The first figure of the third row has to be mirrored along a diagonal axis from top-right to bottom-left.