A body of density \( \rho \) is dropped from rest from height \( h \) (from the surface of water...

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A body of density \( \rho \) is dropped from rest from height \( h \) (from the surface of water) into a lake of density of water \( \sigma(\sigma\rho) \). Neglecting all dissipative effects, the acceleration of body while it is in the lake is
(a) \( g\left(\frac{\sigma}{\rho}-1\right) \) upwards
(b) \( g\left(\frac{\sigma}{\rho}-1\right) \) downwards
(c) \( g\left(\frac{\sigma}{\rho}\right) \) upwards
(d) \( g\left(\frac{\sigma}{\rho}\right) \) downwards
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