A cylindrical box of radius 5 cm contains 10 solid spherical balls, each of radius 5 cm. If the top most ball touches the upper cover of the box, then the volume of empty space in the box is :

A

$$\frac{2500}{3}\pi cm^{3}$$

B

$$5000\pi cm^{3}$$

C

$$2500\pi cm^{3}$$

D

$$\frac{5000}{3}\pi cm^{3}$$