Four rods of side length `l` have been hinged to form a rhombus. Vertex `A` is fixed to a rigid support, vertex `C` is being moved along the `x`-axis with constant velocity `V` as shown in figure. The rate at which vertex `B` is nearing the `x`-axis at the moment the rhombus is in the form of a squarem is
A. `v/4`
B. `v/3`
C. `v/2`
D. `v/(sqrt(2))`