Ans is option (A)
Height of the cylinder $=10\times(2\times5cm)=100cm$ .
$\therefore$ Volume of empty space in the box: $\pi r^{2}h-(10\times\frac{4}{3}\times \pi \times r^{3})$ cubic cm.
$\Rightarrow$ $(\pi \times 25\times50)-(10\times\frac{4}{3}\times \pi \times 5^{3})=\frac{2500}{3}$ cubic cm.