How are the materials that make up Earth’s interior stratified in relation to their densities?

A  The lowest-density materials make up the ocean floor, and the highest-density materials make up the mountains.

B  The highest-density materials make up the ocean floor, and the lowest-density materials make up the mountains.

C  The materials are homogenous throughout Earth’s interior.

D  The highest-density materials are concentrated at Earth’s core, whereas lower-density materials are located closer to Earth’s surface.

E  The lowest-density materials are concentrated at Earth’s core, whereas higher-density materials are located closer to Earth’s surface.