A spherical iron ball of $10 \mathrm{~cm}$ radius is coated with a layer of ice of uniform thickness

Question

A spherical iron ball of $10 \mathrm{~cm}$ radius is coated with a layer of ice of uniform thickness that melts at a rate of $50 \mathrm{~cm}^{3}$ / $\mathrm{min}$. When the thickness of ice is $5 \mathrm{~cm}$, then the rate (in $\mathrm{cm} / \mathrm{min}$.) at which of the thickness of ice decreases, is\

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(d)