The two femurs each of cross-sectional area l0 ${\mathrm{cm}}^2$ support the upper part of a human body of mass 40 kg. The average pressure sustained by the femurs is (Take g : l0 ${\mathrm{ms}}^{-2}$)

• A

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

• B

  $2\times {10}^4 {\mathrm{Nm}}^{-2}$

• C

  $2\times {10}^5 \mathrm{N} {\mathrm{m}}^{-2}$

• D

  $2 \times {10}^{6 }{\mathrm{Nm}}^{-2}$