Density of ice is ρ and that of water is σ. What will be the decrease in volume when a mass M of ice melts

Q: Density of ice is ρ and that of water is σ . What will be the decrease in volume when a mass M of ice melts

(a) $\frac{M}{\sigma – \rho}$

(b) $\frac{\sigma – \rho}{M}$

(c) $M [ \frac{1}{\rho} – \frac{1}{\sigma}] $

(d) $ \frac{1}{M} [ \frac{1}{\rho} – \frac{1}{\sigma}] $

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Ans: (c)