The density $\mathrm{\rho }$ of water of bulk modulus B at a depth y in the ocean is related to the density at surface ${\mathrm{\rho }}_{0}$ by the relation

(a) $\mathrm{\rho }={\mathrm{\rho }}_{0}\left[1-\frac{{\mathrm{\rho }}_{0}\mathrm{gy}}{\mathrm{B}}\right]$                            (b) $\mathrm{\rho }={\mathrm{\rho }}_{0}\left[1+\frac{{\mathrm{\rho }}_{0}\mathrm{gy}}{\mathrm{B}}\right]$

(c) $\mathrm{\rho }={\mathrm{\rho }}_{0}\left[1+\frac{\mathrm{B}}{{\mathrm{\rho }}_{0}\mathrm{gy}}\right]$                             (d) $\mathrm{\rho }={\mathrm{\rho }}_{0}\left[1-\frac{\mathrm{B}}{{\mathrm{\rho }}_{0}\mathrm{gy}}\right]$

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