The adjacent graph shows the extension $(\Delta l)$ of a wire of length $1 \ m$ suspended from the top of a roof at one end with a load $W$ connected to the other end. If the cross-sectional area of the wire is $10^{-6} \ m^2$,calculate the Young's modulus of the material of the wire.

• A
  $2 \times 10^{11} \ N/m^2$
• B
  $2 \times 10^{-11} \ N/m^2$
• C
  $3 \times 10^{-12} \ N/m^2$
• D
  $2 \times 10^{-13} \ N/m^2$