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 ____________

\[ \left[\mathrm{g}=10 \mathrm{~ms}^{-2} \right] \]

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