Out of given options, which figure can replace ?

The correct answer is Option (1) → 

In every figure the small circle sits at the end of a line that continues one side of the figure. The figures go in pairs of the same shape: two rectangles, then two triangles. Within a pair, the line moves to the other end of the same side and points the other way: the rectangle’s right side carries it first below the bottom corner, then above the top corner. The triangle’s line continues its left side above the top corner, so in the fourth figure it continues the left side below the bottom left corner, pointing down and to the left.