The Density of Earth's Crust, Mantle, and Core Increases Moving

Multiple Choice

The density of Earth's crust, mantle, and core increases moving toward Earth's center because

A) Earth's elements are distributed evenly throughout its interior.
B) Early in Earth's history, it separated into layers according to density.
C) Earth is plastic throughout its structure today and in the past.
D) The charged particles flowing in the outer core repel the lighter elements found at Earth's surface.