A planetarium is spherical in shape with a diameter of $30\;m$. What can be its volume ?

Question

$\begin{array}{1 1} (a)\; 4000 \; \pi\;m^3 \\ (b)\; 4225 \; \pi\;m^3 \\ (c)\; 4500\; m^3 \\ (d)\; 4750\;m^3 \end{array}$