The mass and length of a wire are M and Z, respectively. The density of the material of the wire is d. On applying the force F on the wire, the increase in length is l. Then the Young's modulus of the material of the wire will be

• A

  $\frac{\mathrm{Fdl}}{\mathrm{Ml}}$

• B

  $\frac{\mathrm{FL}}{\mathrm{Mdl}}$

• C

  $\frac{\mathrm{FMl}}{\mathrm{dl}}$

• D

  $\frac{{\mathrm{FdL}}^2}{\mathrm{Ml}}$