A Neutron Star Has Approximately the Same Density as Nuclear

A neutron star has approximately the same density as nuclear material. A typical neutron star has a radius of 8.0 km. Using the relationship r = (1.2 fm) A^1/3 together with the mass of a neutron, 1.67 × 10⁻²⁷kg, estimate the mass of a neutron star.

A) 0.65 × 10³⁰ kg
B) 1.5 × 10³⁰ kg
C) 0.16 × 10³⁰ kg
D) 0.49 × 10³⁰ kg