Equi convex lens is placed such that optic axis coincides with the x-axis, position of object is $(-40 \;cm, 1 \;cm)$ and position of image $(50 \;cm, -2\;cm)$ where is the lens located

Question

$(a)\;at \;origin \\ (b)\;+20 \;cm \\ (c)\;-20\;cm \\ (d)\;-10\;cm$