The adjacent graph shows the extension $\left(\mathrm{\Delta l}\right)$ of a wire of length 1m 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 m², calculate the Young's modulus of the material of the wire. 

• A

  $2\times {10}^{11}\mathrm{N}/{\mathrm{m}}^2$

• B

  $2\times {10}^{-11}\mathrm{N}/{\mathrm{m}}^2$

• C

  $3\times {10}^{-12}\mathrm{N}/{\mathrm{m}}^2$

• D

  $2\times {10}^{-13}\mathrm{N}/{\mathrm{m}}^2$