Just Before the Outer Layers of a High-Mass Star Are

Just before the outer layers of a high-mass star are thrown into space in a supernova explosion, the density in its core is about that:

A) of iron metal, 7.5 × 10³ kg/m³.
B) of degenerate gases in white dwarf stars, about 10³ kg/m³.
C) at the center of the Sun, about 1.5 × 10⁵ kg/m³.
D) of nuclear matter in a normal nucleus, about 4 × 10¹⁷ kg/m³.