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The main diagonal, the Middle shape is different, (Circle, then Triangle, so it is square) THEN when we look at the Columns, we see in the top Box, one shape is in the same place in the bottom shape ( Meddle left triangle, in the left most column) (The X in the center in the middle Column) meaning that the right column MUST have a shape, if left and triangle have been used, all that is left is the circle, meaning it has to be C,E,F,G.
It cannot Be E since it does not follow the X observation
It cannot be G because (Triangle OO is impossible following the bottom row)
It cannot be F because the Double triangle (look at the Bottom Row, Triangle XX, then XXO, follow it, would make OO Triangle)
Thus leaving C
