Certain Stars at the End of Their Lives Are Thought

Certain stars at the end of their lives are thought to collapse combining their protons and electrons together to form a neutron star.Such a star could be thought of as a giant atomic nucleus.If a star of mass equal to that of the Sun (M = 1.99 × 10³⁰ kg) collapsed into neutrons (m_n = 1.67 × 10−²⁷ kg) ,what would be the radius of such a star? (Hint: r = r₀A^1/3,where r₀ = 1.20 × 10−¹⁵ m) .

A) 25.4 km
B) 18.7 km
C) 12.7 km
D) 6.40 km