The Central Regions of Earth's Core Are a Solid Because

Multiple Choice

The central regions of Earth's core are a solid because

A) the composition at the center of the core is lower in iron.
B) the pressure at the center raises the melting point.
C) the magnetic field cannot penetrate into the center of the core.
D) convection does not extend all the way to the center of the core.
E) Earth initially formed from solid particles in the solar nebula.