Neutron Star

A spherical neutron star has density equal to that of the nucleus. The radius of the neutron star having mass $5.0 \times 10^{30}$ kg is

(A) $\sqrt 2$ km
(B) $\sqrt 3$ km
(C) $\sqrt 2 \times 10^4 $ m
(D) $\sqrt 3 \times 10^4 $ m