A Rod with a Diameter of 2

A rod with a diameter of 2.00 mm, projects 20.0 mm horizontally outward from a wall. A 10.0 N weight is hung from the end of the rod and the rod deflects downward by 4.00 × 10^-6 m. The shear strain of the rod is

A) 1.00 × 10^-4.
B) 1.50 × 10^-4.
C) 2.00 × 10^-4.
D) 2.50 × 10^-4.
E) 3.00 × 10^-4.