A reservoir $500\mathrm{m}$ deep is filled with a fluid of density $850{\mathrm{kgm}}^{-3}$. If the atmospheric pressure is $1.05\times {10}^5{\mathrm{Nm}}^{-2}$, the pressure at the bottom of the reservoir is ____________

$$[\mathrm{g}=10{\mathrm{ms}}^{-2}]$$

A. $4.72\times {10}^6{\mathrm{Nm}}^{-2}$
B. $4.36\times {10}^6{\mathrm{Nm}}^{-2}$  
C. $4.28\times {10}^6{\mathrm{Nm}}^{-2}$
D. $4.25\times {10}^6{\mathrm{Nm}}^{-2}$

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Correct Answer: B