A submarine is fitted with circular windows with a diameter of $0.30\,\text{m}$. These windows can withstand a highest external pressure of $660\,\text{kPa}$ before cracking. What minimum external force is required to crack the windows?
- A$47\,000\,\text{N}$
- B$190\,000\,\text{N}$
- C$310\,000\,\text{N}$
- D$620\,000\,\text{N}$