Why Is the Very Center of Earth's Core a Solid

Why is the very center of Earth's core a solid and not a liquid?

A) There is less metal in the central core.
B) The central core has a combination of gases with the metals.
C) Accretion "seeded" Earth with a solid central core.
D) The pressure at the central core raises the melting point of the metals higher than its temperature.
E) The central core is a frozen block of water ice.

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