From the relation $R=R_0A^{1/3}$, where $R_0$ is a constant and A is the mass number of a nucleus , show that the nuclear matter density is nearly a constant (ie independent of A)

Question

$\begin{array}{1 1} \frac{3 R_0^3}{4 \pi m} \\\frac{3 \pi}{4m R_0^3} \\ \frac{4m }{3 \pi R_0^3} \\ \frac{3m}{4 \pi R_0^3} \end{array} $