A rectangular steel block that holds up a very large bridge component has a height of $15\,\text{cm}$ and a cross-section measuring $20\,\text{cm} \times 12\,\text{cm}$. It is intended to shorten by $1\,\text{mm}$ when the maximum uniformly distributed load acts on it. The Young modulus of steel is $2.0 \times 10^{11}\,\text{N m}^{-2}$. Determine the greatest load it can carry.
- A$32\,\text{MN}$
- B$56\,\text{GN}$
- C$720\,\text{GN}$
- D$32\,\text{TN}$