To What Does Planetary Differentiation Refer

To what does planetary differentiation refer?

A) large-scale convection of molten rock in the mantle of a planet, which on Earth causes continental drift
B) sinking of heavier elements toward the center of a planet and the floating of lighter elements toward the surface
C) circulation of iron in the core of a planet, resulting in the generation of a magnetic field
D) formation of rocky planets in the hotter, inner solar system and gas giants in the colder, outer regions

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